is thesis a primary source

Primary Sources Guide

Understanding research sources.

• Evaluating Primary Sources
• African American Studies
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• Citing Primary Sources

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• What are Primary Sources?
• What are Secondary Sources?
• What are Tertiary Sources?

A primary source is a first-hand account from a person or organization who:

• Created an original work
• Participated in new scientific discoveries
• Witnessed an event

Some examples of primary sources include:

• Art and artifacts
• Autobiographies, diaries, and memoirs
• Interviews and oral histories
• Novels and poetry
• Photographs
• Data and surveys

Why are primary sources useful?  Primary sources are useful to:

• Observe and analyze an event from an eyewitness perspective
• Develop your own opinions and explanations
• Learn if you agree or disagree with the authors of secondary/tertiary sources and their conclusions

A secondary source has the following qualities:

• It comments on or analyzes something
• It often summarizes or interprets primary sources
• It's usually written by someone who was not directly involved or an eyewitness

Some examples of secondary sources include:

• Analysis or criticism, such as literary criticism
• Biographies
• Essays and reviews

Why are secondary sources useful? Secondary sources are useful because they:

• Help you consider diverse viewpoints about a topic
• Organize and outline information in an approachable way
• Offer information and analysis from experts

Remember, secondary sources are often based on studying and analyzing primary sources . Another way to think about it? Your research paper is a secondary source because you're analyzing and interpreting other sources.

A tertiary source has the following qualities:

• It lists and compiles information without additional analysis
• It repackages important ideas and information from other primary and secondary sources

Some examples of tertiary sources include:

• Directories of local, state, and national organizations
• Encyclopedias and dictionaries
• Guidebooks and handbooks

Why are tertiary sources useful? Tertiary sources are useful because they help you:

• Gather background information about a topic or concept
• Find a variety of information in one source
• Provide information in a concise and compact way

Examples of Primary Sources vs. Other Sources

• Communications

One area of study at Central Piedmont where primary sources are often used is History . Here are some examples:

• Primary Source = Autobiography :  Narrative of the Life of Frederick Douglass: An American Slave by Frederick Douglass
• Secondary Source = Biography :  Frederick Douglass: Prophet of Freedom by David W. Blight

Another area of study at Central Piedmont where primary sources often come into play is English . Here are some examples:

• Primary Source = Novel :  Love in the Time of Cholera by Gabriel García Márquez
• Secondary Source = Literary Criticism :  Gabriel García Márquez in Retrospect: A Collection Book , edited by Gene H. Bell-Villada

One other area of study at Central Piedmont where primary sources often come into play is Communications . Here are some examples:

• Primary Sources = Memoir :  Deaf Utopia: A Memoir--And a Love Letter to a Way of Life  by Nyle DiMarco
• Secondary Sources = Journal Article : "Curriculum and Instruction for Deaf and Hard of Hearing Students: Evidence from the Past—Considerations for the Future" (2023) by Maria C. Hartman, Elaine R. Smolen, and Brynne Powell
• Tertiary Sources = Reference Book :  American Sign Language: A Step-by-Step Guide to Signing by Suzie Chafin

Credit : Austin Community College's Primary Sources guide served as the inspiration and model for this LibGuide.

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Primary, Secondary, and Tertiary Sources: A Quick Guide: Primary Sources

• Primary Sources
• Secondary Sources
• Tertiary Sources

What is a Primary Source?

Here are two definitions that try to capture the elusive nature of primary documents.

A definition from Cornell University:

A definition from Yale University:

"What are primary sources? Primary sources provide firsthand testimony or direct evidence concerning a topic or question under investigation.

They are usually created by witnesses or recorders who experienced the events or conditions being documented. Often these sources are created at the time when the events or conditions are occurring, but primary sources can also include autobiographies, memoirs, and oral histories recorded later." [ Primary Sources at Yale . Yale University.] Also on this site: Primary Sources come in all shapes and sizes.

A Photograph Can be a Primary Source

Antietam, Md. President Lincoln with Gen. George B. McClellan and group of officers. [October 3, 1862] Gardner, Alexander, 1821-1882, photographer. Source : Library of Congress, Prints & Photographs Division

Online Collections of Primary Sources: Examples

• Library of Congress. Digital Collections. Washington: Library of Congress, National Digital Library Program, 1994- .
• History: Primary Sources Databases. Cornell University Library.
• Making of America: The Cornell University Library MOA collection Ithaca, NY: Cornell University Library, 1996- .
• Valley of the Shadow: Two Communities in the American Civil War

Permissions Information

If you wish to use or adapt any or all of the content of this Guide go to Cornell Library's Research Guides Use Conditions to review our use permissions and our Creative Commons license.

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• Last Updated: Apr 12, 2024 4:30 PM
• URL: https://guides.library.cornell.edu/sources

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Primary, Secondary, and Tertiary Sources

Search catalog, what are the differences.

Sources of information or evidence are often categorized as primary, secondary, or tertiary material. These classifications are based on the originality of the material and the proximity of the source or origin. This informs the reader as to whether the author is reporting information that is first hand or is conveying the experiences and opinions of others which is considered second hand. Determining if a source is primary, secondary or tertiary can be tricky. Below you will find a description of the three categories of information and examples to help you make a determination.

Primary Sources

These sources are records of events or evidence as they are first described or actually happened without any interpretation or commentary. It is information that is shown for the first time or original materials on which other research is based.  Primary sources display original thinking, report on new discoveries, or share fresh information.

Secondary Sources

These sources offer an analysis or restatement of primary sources. They often try to describe or explain primary sources. They tend to be works which summarize, interpret, reorganize, or otherwise provide an added value to a primary source.

Tertiary Sources

These are sources that index, abstract, organize, compile, or digest other sources. Some reference materials and textbooks are considered tertiary sources when their chief purpose is to list, summarize or simply repackage ideas or other information. Tertiary sources are usually not credited to a particular author.

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Image of what the Tower Of Babel might have looked like, illustrating a discussion of whether it might have reached as far as the moon. STRONG ROOM OGDEN A FOLIO 450  Athanasius Kircher, Turris Babel (1679) 

A primary source is a first-hand expression or evidence of an event or experience. This evidence can be in the form of the written word, images, artefacts, data, film or sound recordings, and will have been created at some point during the lifetime of the person involved. Using primary sources in your research adds context and credibility to your argument. Primary sources will vary depending upon what is being studied.

Databases available through Library Services

• Primary sources A list of all databases available through UCL Library Services that contain primary source content.
• Audiovisual content View and access databases of audiovisual content available through UCL Library Services.
• Newspapers Details on the many online newspapers to which UCL subscribes, and how UCL staff and students can find and access them.
• Guide to data and statistics Includes resource lists mainly in the social sciences, alongside support material and FAQs, but also pointers to finding data more generally. Also, there’s further information and guidance about analysing, visualising, referencing and managing data, as well as text and data mining.

UCL Special Collections

• UCL Special Collections UCL Library Special Collections is one of the foremost university collections of manuscripts, archives and rare books in the UK. There are also archives located at several of our specialist libraries, while documents concerning UCL’s history are also held by the Records Office.
• Special Collections Primary Sources Our Special Collections team have compiled an online reading list of Special Collections Primary Sources to support dissertations and research projects.

Examples of primary sources

• Books and manuscripts
• Ephemera (posters, invites, greetings cards, receipts, handbills etc.)
• Film and video, images, photographs and original artwork
• Interviews and speeches
• Pamphlets, magazines and newsletters
• Newspapers, news sheets and newsbooks
• Parliamentary, legal and official documents (Government publications, census data, court cases, business records etc.)
• Personal writings (memoirs, letters etc.)
• Reports and grey literature
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Primary Sources: A Research Guide

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Primary Sources

Texts of laws and other original documents.

Newspaper reports, by reporters who witnessed an event or who quote people who did.

Speeches, diaries, letters and interviews - what the people involved said or wrote.

Original research.

Datasets, survey data, such as census or economic statistics.

Photographs, video, or audio that capture an event.

Secondary Sources

Secondary Sources are one step removed from primary sources, though they often quote or otherwise use primary sources. They can cover the same topic, but add a layer of interpretation and analysis. Secondary sources can include:

Most books about a topic.

Analysis or interpretation of data.

Scholarly or other articles about a topic, especially by people not directly involved.

Documentaries (though they often include photos or video portions that can be considered primary sources).

When is a Primary Source a Secondary Source?

Whether something is a primary or secondary source often depends upon the topic and its use.

A biology textbook would be considered a secondary source if in the field of biology, since it describes and interprets the science but makes no original contribution to it.

On the other hand, if the topic is science education and the history of textbooks, textbooks could be used a primary sources to look at how they have changed over time.

Examples of Primary and Secondary Sources

Adapted from Bowling Green State University, Library User Education, Primary vs. Secondary Sources .

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• Primary vs. Secondary Sources | Difference & Examples

Primary vs. Secondary Sources | Difference & Examples

Published on 4 September 2022 by Raimo Streefkerk . Revised on 15 May 2023.

When you do research, you have to gather information and evidence from a variety of sources.

Primary sources provide raw information and first-hand evidence. Examples include interview transcripts, statistical data, and works of art. A primary source gives you direct access to the subject of your research.

Secondary sources provide second-hand information and commentary from other researchers. Examples include journal articles, reviews, and academic books . A secondary source describes, interprets, or synthesises primary sources.

Primary sources are more credible as evidence, but good research uses both primary and secondary sources.

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Table of contents

What is a primary source, what is a secondary source, primary and secondary source examples, how to tell if a source is primary or secondary, primary vs secondary sources: which is better, frequently asked questions about primary and secondary sources.

A primary source is anything that gives you direct evidence about the people, events, or phenomena that you are researching. Primary sources will usually be the main objects of your analysis.

If you are researching the past, you cannot directly access it yourself, so you need primary sources that were produced at the time by participants or witnesses (e.g. letters, photographs, newspapers ).

If you are researching something current, your primary sources can either be qualitative or quantitative data that you collect yourself (e.g. through interviews, surveys, experiments) or sources produced by people directly involved in the topic (e.g. official documents or media texts).

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A secondary source is anything that describes, interprets, evaluates, or analyses information from primary sources. Common examples include:

• Books , articles and documentaries that synthesise information on a topic
• Synopses and descriptions of artistic works
• Encyclopaedias and textbooks that summarize information and ideas
• Reviews and essays that evaluate or interpret something

When you cite a secondary source, it’s usually not to analyse it directly. Instead, you’ll probably test its arguments against new evidence or use its ideas to help formulate your own.

Examples of sources that can be primary or secondary

A secondary source can become a primary source depending on your research question . If the person, context, or technique that produced the source is the main focus of your research, it becomes a primary source.

To determine if something can be used as a primary or secondary source in your research, there are some simple questions you can ask yourself:

• Does this source come from someone directly involved in the events I’m studying (primary) or from another researcher (secondary)?
• Am I interested in analysing the source itself (primary) or only using it for background information (secondary)?
• Does the source provide original information (primary) or does it comment upon information from other sources (secondary)?

Most research uses both primary and secondary sources. They complement each other to help you build a convincing argument. Primary sources are more credible as evidence, but secondary sources show how your work relates to existing research.

What do you use primary sources for?

Primary sources are the foundation of original research. They allow you to:

• Make new discoveries
• Provide credible evidence for your arguments
• Give authoritative information about your topic

If you don’t use any primary sources, your research may be considered unoriginal or unreliable.

What do you use secondary sources for?

Secondary sources are good for gaining a full overview of your topic and understanding how other researchers have approached it. They often synthesise a large number of primary sources that would be difficult and time-consuming to gather by yourself. They allow you to:

• Gain background information on the topic
• Support or contrast your arguments with other researchers’ ideas
• Gather information from primary sources that you can’t access directly (e.g. private letters or physical documents located elsewhere)

When you conduct a literature review , you can consult secondary sources to gain a thorough overview of your topic. If you want to mention a paper or study that you find cited in a secondary source, seek out the original source and cite it directly.

Remember that all primary and secondary sources must be cited to avoid plagiarism . You can use Scribbr’s free citation generator to do so!

Common examples of primary sources include interview transcripts , photographs, novels, paintings, films, historical documents, and official statistics.

Anything you directly analyze or use as first-hand evidence can be a primary source, including qualitative or quantitative data that you collected yourself.

Common examples of secondary sources include academic books, journal articles , reviews, essays , and textbooks.

Anything that summarizes, evaluates or interprets primary sources can be a secondary source. If a source gives you an overview of background information or presents another researcher’s ideas on your topic, it is probably a secondary source.

To determine if a source is primary or secondary, ask yourself:

• Was the source created by someone directly involved in the events you’re studying (primary), or by another researcher (secondary)?
• Does the source provide original information (primary), or does it summarize information from other sources (secondary)?
• Are you directly analyzing the source itself (primary), or only using it for background information (secondary)?

Some types of sources are nearly always primary: works of art and literature, raw statistical data, official documents and records, and personal communications (e.g. letters, interviews ). If you use one of these in your research, it is probably a primary source.

Primary sources are often considered the most credible in terms of providing evidence for your argument, as they give you direct evidence of what you are researching. However, it’s up to you to ensure the information they provide is reliable and accurate.

Always make sure to properly cite your sources to avoid plagiarism .

A fictional movie is usually a primary source. A documentary can be either primary or secondary depending on the context.

If you are directly analysing some aspect of the movie itself – for example, the cinematography, narrative techniques, or social context – the movie is a primary source.

If you use the movie for background information or analysis about your topic – for example, to learn about a historical event or a scientific discovery – the movie is a secondary source.

Whether it’s primary or secondary, always properly cite the movie in the citation style you are using. Learn how to create an MLA movie citation or an APA movie citation .

Articles in newspapers and magazines can be primary or secondary depending on the focus of your research.

In historical studies, old articles are used as primary sources that give direct evidence about the time period. In social and communication studies, articles are used as primary sources to analyse language and social relations (for example, by conducting content analysis or discourse analysis ).

If you are not analysing the article itself, but only using it for background information or facts about your topic, then the article is a secondary source.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

Streefkerk, R. (2023, May 15). Primary vs. Secondary Sources | Difference & Examples. Scribbr. Retrieved 6 May 2024, from https://www.scribbr.co.uk/working-sources/primary-vs-secondary-sources/

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What Are Primary Sources? - A Quick Tutorial

• Research Skills Primary Sources RSPS helps introduce humanities and social science researchers to the key approaches and methodologies of working with source material. It contains hundreds of essays, videos, “How to” guides, and case studies, all developed by subject specialists and designed to answer your questions about working with primary sources.

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What is a Primary Source?

A primary source is a first-hand account of an event, time period, or philosophical era.

A primary source may include:

• diaries, journals, speeches, letters, interviews, office memos and other papers if the author was present at the event being written about
• memoirs and autobiographies describing events where the author was present
• government documents, such as census records
• reports and minutes of organizations that reflect events, conditions and ideas of the time
• books, journals and newspapers written at the time of the event in question
• photographs, audio tapes, and film that document an event
• research data documenting scientific data at the time
• artifacts of all kinds, which may include buildings (architecture), household items, cave drawings, clothing, paintings, pottery

Primary Sources do not include:

• memoirs or autobiographies that reflect on an event that the author was not present for, unless it reflects the popular opinion of the time
• a critical analysis of a work of literature that was written much later than the actual work
• documentation of ideas or psychology of a time may be found in popular fiction, films, educational material etc produced during that time period
• a critical analysis of an historical event that was written much later

Reasons for Using Primary Sources for Research

Why should i use primary sources.

• Scholarly Research should be based on fact and observation, which involves the use of primary sources.
• They are used so that you can form your own opinion, based on the facts. They also allow you to understand how people feel, at the time, about an event or a person.
• Primary sources are used to show your professor that you have done the research required to produce a quality paper.
• Using primary sources shows your professor that you are able to take the facts, interpret them, and draw your own conclusion, rather than just regurgitate other people's work.
• You should produce a better quality paper if it has some primary sources to back up your thesis statement.
• A mixture of sources produces a more substantial paper - use primary and secondary; scholarly and popular; paper and electronic; ideas and artifacts; fact and fiction, etc.  

Top 5 Resources

• Gale Primary Sources Gale Primary Resources is a research tool that allows researchers to cross-search multiple primary source databases using a single search box. It includes the following databases: Archives Unbound, Eighteenth Century Collections Online, The Making of the Modern World, Nineteenth Century Collections Online, and Sabin Americana 1500-1926 as well as the historical archives of several major periodicals (The Economist, Punch, The Times and more). Each database can also be searched individually.
• Past Masters (Full Text Humanities) This link opens in a new window Concentrating on primary sources in philosophy, religion, and literature, Past Masters gathers the books, diaries, letters, and correspondence of major intellects from across the centuries. Titles are typically comprised of the complete collected works of each individual author. Users may conduct searches or browse materials by title, subject (e.g., Women Writers, Religious Studies, or Continental Philosophy), or language (e.g., English, Latin, Greek, or Russian).
• Library of Congress - Digital Collections Contains hundreds of collections of digitized American history and culture resources, curated by the national library of the United States.
• National Archives The National Archives holds historical U.S. government documents (federal, congressional, and presidential records) that are created or received by the President and his staff, by Congress, by employees of Federal government agencies, and by the Federal courts in the course of their official duties.

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Primary Sources Research Guide

• What Are Primary Sources?
• What Are Secondary Sources?
• Examples of Primary & Secondary Sources
• Where to Look for Primary Sources

Get Primary Sources by Subject

Many library subject guides contain sections on primary sources for those subjects. BELOW you can also see a list of research guides that have been tagged "primary sources."

Still have questions? Please get in touch with the librarian for your subject area for more information about specific primary sources in your field.

Defining Primary Sources

• Primary sources are original materials that provide direct evidence or first-hand testimony concerning a topic or event -- firsthand records created by people who actually participated in or remembered an event and reported on the event and their reactions to it.
• Primary sources can be contemporary sources created at the time when the event occurred (e.g., letters and newspaper articles) or later (such as, memoirs and oral history interviews).
• Primary sources may be published or unpublished. Unpublished sources include unique materials (e.g., family papers) often referred to as archives and manuscripts.
• What constitutes a primary source varies by discipline -- see Primary Sources by Discipline below . How the researcher uses the source generally determines whether it is a primary source or not.

*This material is used with permission from the University of Pittsburgh Library's research guide on Primary Sources

Primary Sources by Discipline

The definition of a primary source varies depending upon the academic discipline and the context in which it is used.

1. In the humanities , a primary source could be defined as something that was created either during the time period being studied or afterward by individuals reflecting on their involvement in the events of that time.

Examples from the humanities:  

Art: painting, photograph, print, sculpture, film or other work of art, sketch book, architectural model or drawing, building or structure, letter,  organizational records, personal account by artist History: artifact, diary, government report, interview, letter, map, news report, oral history, organizational records, photograph, speech, work of art Literature: interview, letter, manuscript, personal account by writer, poem, work of fiction or drama, contemporary review Music: score, sound recording, contemporary review, letter, personal account by composer or musician

2. In the social sciences , the definition of a primary source would be expanded to include numerical data that has been gathered to analyze relationships between people, events, and their environment.  

Examples from the social sciences: 

Anthropology: artifact, field notes, fossil, photograph Business: market research or surveys, anything that documents a corporation's activities, such as annual reports, meeting minutes, legal documents, marketing materials, and financial records. Communication: websites, blogs, broadcast recordings and transcripts, advertisements and commercials, public opinion polls, and magazines (e.g., Rolling Stone ). Economics: company statistics, consumer survey, data series Geography: field notes, census data, maps, satellite images, and aerial photographs. Law: code, statute, court opinion, legislative report Psychology: case study, clinical case report, experimental replication, follow-up study, longitudinal study, treatment outcome study Sociology: cultural artifact, interview, oral history, organizational records, statistical data, survey

3. In the natural sciences , a primary source could be defined as a report of original findings or ideas. These sources often appear in the form of research articles with sections on methods and results.

Examples in the natural sciences:

Biology, Chemistry, etc: research or lab notes, genetic evidence, plant specimens, technical reports, and other reports of original research or discoveries (e.g., conference papers and proceedings, dissertations, scholarly articles).

*This material is used with permission from the Lafayette College Library research guide on primary sources . Image 1: "Massachusetts Bay Colony 1776"  CC BY-NC-ND 2.0 Tom Woodward: Flickr Image 2: "data"  CC BY-NC-ND 2.0 CyberHades: Flickr Image 3: "Katydid 50x Magnification Wing, Coventry, CT"  CC BY-NC-ND 2.0 Macroscopic Solutions: Flickr

Examples of Primary Sources

Primary sources typically include such items as:

• manuscripts, letters, first-person diaries, memoirs, personal journals, interviews, speeches, oral histories, and other materials individuals used to describe events in which they were participants or observers. Many of these materials frequently are referred to as " papers ";
• records of government agencies and other organizations, including such documents as parliamentary debates, proceedings of organization meetings, conferences, etc. Many of these materials frequently are referred to as " archives ";
• original documents such as birth certificates, marriage and baptismal registers, wills, trial transcripts, etc.;
• published materials written at the time of the event, including newspapers, news magazines, advertising, cartoons, and other ephemeral publications such as pamplets and flyers;
• contemporary creative works of literature, art, and music, such as novels, paintings, compositions, poems, etc.;
• contemporary photographs, maps, audio recordings, television and radio broadcasts, and moving pictures;
• Internet communications including email, listservs, and blogs;
• statistical and numeric data collected by various government and private agencies, including census data, opinion polls, and other surveys;
• research reports and case studies in the sciences or social sciences;
• artifacts of all kinds such as coins, clothing, fossils, furniture, and musical instruments from the time period under study

Primary sources sometimes can be ambiguous and contradictory, relecting a specific person's opinions and contemporary cultural influences on them. For that very reason such sources are invaluable tools for developing your own interpretations and reaching your own conclusions about what is going on at a point in time.

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Identifying Primary and Secondary Sources

• Examples: Primary Sources
• Examples: Secondary Sources

The materials, evidence, or data used in your research are known as sources. As foundations of your research, these sources of information are typically classified into two broad categories— primary and secondary.

Primary Sources

A  primary source  provides direct or firsthand evidence about an event, object, person or work of art. Characteristically, primary sources are contemporary to the events and people described and show minimal or no mediation between the document/artifact and its creator. As to the format, primary source materials can be written and non-written, the latter including sound, picture, and artifact. Examples of primary sources include:

Secondary Sources

A  secondary source , in contrast, lacks the immediacy of a primary record. As materials produced sometime after an event happened, they contain information that has been interpreted, commented, analyzed or processed in such a way that it no longer conveys the freshness of the original. History textbooks, dictionaries, encyclopedias, interpretive journal articles, and book reviews are all examples of secondary sources. Secondary sources are often based on primary sources. Primary and Secondary Sources Compared An example from the printed press serves to further distinguish primary from secondary sources. In writing a narrative of the political turmoil surrounding the 2000 U.S. presidential election, a researcher will likely tap newspaper reports of that time for factual information on the events. The researcher will use these reports as primary sources because they offer direct or firsthand evidence of the events, as they first took place. A column in the Op/Ed section of a newspaper commenting on the election, however, is less likely to serve these purposes. In this case, a columnist’s analysis of the election controversy is considered to be a secondary source, primarily because it is not a close factual account or recording of the events. Bear in mind, however, that primary and secondary sources are not fixed categories. The use of evidence as a primary or secondary source hinges on the type of research you are conducting. If the researcher of the 2000 presidential election were interested in people’s perceptions of the political and legal electoral controversy, the Op/Ed columns will likely be good primary sources for surveying public opinion of these landmark events.

Primary Source Searching 

The chart below illustrates possible uses of primary and secondary sources by discipline, primary source searching in iucat.

Use the IU online library ca

talog (IUCAT) to look for primary source materials. Employ the Library of Congress subject heading subdivisions below to retrieve primary materials from IUCAT. These subdivisions indicate the form in which the material is organized and presented.

Subject Heading Subdivisions

Source Search Examples

Use the subject subdivisions to build search statements that may include names, events or topics. Below is a select sample of library catalog searches. Enter these terms and search for as Subject in IUCAT. You may also wish to try search for a ALL Fields which will give you a larger but less focused result. Use the AND operator (or the + sign) to combine ideas; for example, novelists and correspondence. AND will find your search words in any section of the subject headings and will increase the likelihood that you will find relevant material

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Writing a Paper: Thesis Statements

Basics of thesis statements.

The thesis statement is the brief articulation of your paper's central argument and purpose. You might hear it referred to as simply a "thesis." Every scholarly paper should have a thesis statement, and strong thesis statements are concise, specific, and arguable. Concise means the thesis is short: perhaps one or two sentences for a shorter paper. Specific means the thesis deals with a narrow and focused topic, appropriate to the paper's length. Arguable means that a scholar in your field could disagree (or perhaps already has!).

Strong thesis statements address specific intellectual questions, have clear positions, and use a structure that reflects the overall structure of the paper. Read on to learn more about constructing a strong thesis statement.

Being Specific

This thesis statement has no specific argument:

Needs Improvement: In this essay, I will examine two scholarly articles to find similarities and differences.

This statement is concise, but it is neither specific nor arguable—a reader might wonder, "Which scholarly articles? What is the topic of this paper? What field is the author writing in?" Additionally, the purpose of the paper—to "examine…to find similarities and differences" is not of a scholarly level. Identifying similarities and differences is a good first step, but strong academic argument goes further, analyzing what those similarities and differences might mean or imply.

Better: In this essay, I will argue that Bowler's (2003) autocratic management style, when coupled with Smith's (2007) theory of social cognition, can reduce the expenses associated with employee turnover.

The new revision here is still concise, as well as specific and arguable.  We can see that it is specific because the writer is mentioning (a) concrete ideas and (b) exact authors.  We can also gather the field (business) and the topic (management and employee turnover). The statement is arguable because the student goes beyond merely comparing; he or she draws conclusions from that comparison ("can reduce the expenses associated with employee turnover").

Making a Unique Argument

This thesis draft repeats the language of the writing prompt without making a unique argument:

Needs Improvement: The purpose of this essay is to monitor, assess, and evaluate an educational program for its strengths and weaknesses. Then, I will provide suggestions for improvement.

You can see here that the student has simply stated the paper's assignment, without articulating specifically how he or she will address it. The student can correct this error simply by phrasing the thesis statement as a specific answer to the assignment prompt.

Better: Through a series of student interviews, I found that Kennedy High School's antibullying program was ineffective. In order to address issues of conflict between students, I argue that Kennedy High School should embrace policies outlined by the California Department of Education (2010).

Words like "ineffective" and "argue" show here that the student has clearly thought through the assignment and analyzed the material; he or she is putting forth a specific and debatable position. The concrete information ("student interviews," "antibullying") further prepares the reader for the body of the paper and demonstrates how the student has addressed the assignment prompt without just restating that language.

Creating a Debate

This thesis statement includes only obvious fact or plot summary instead of argument:

Needs Improvement: Leadership is an important quality in nurse educators.

A good strategy to determine if your thesis statement is too broad (and therefore, not arguable) is to ask yourself, "Would a scholar in my field disagree with this point?" Here, we can see easily that no scholar is likely to argue that leadership is an unimportant quality in nurse educators.  The student needs to come up with a more arguable claim, and probably a narrower one; remember that a short paper needs a more focused topic than a dissertation.

Better: Roderick's (2009) theory of participatory leadership  is particularly appropriate to nurse educators working within the emergency medicine field, where students benefit most from collegial and kinesthetic learning.

Here, the student has identified a particular type of leadership ("participatory leadership"), narrowing the topic, and has made an arguable claim (this type of leadership is "appropriate" to a specific type of nurse educator). Conceivably, a scholar in the nursing field might disagree with this approach. The student's paper can now proceed, providing specific pieces of evidence to support the arguable central claim.

Choosing the Right Words

This thesis statement uses large or scholarly-sounding words that have no real substance:

Needs Improvement: Scholars should work to seize metacognitive outcomes by harnessing discipline-based networks to empower collaborative infrastructures.

There are many words in this sentence that may be buzzwords in the student's field or key terms taken from other texts, but together they do not communicate a clear, specific meaning. Sometimes students think scholarly writing means constructing complex sentences using special language, but actually it's usually a stronger choice to write clear, simple sentences. When in doubt, remember that your ideas should be complex, not your sentence structure.

Better: Ecologists should work to educate the U.S. public on conservation methods by making use of local and national green organizations to create a widespread communication plan.

Notice in the revision that the field is now clear (ecology), and the language has been made much more field-specific ("conservation methods," "green organizations"), so the reader is able to see concretely the ideas the student is communicating.

Leaving Room for Discussion

This thesis statement is not capable of development or advancement in the paper:

Needs Improvement: There are always alternatives to illegal drug use.

This sample thesis statement makes a claim, but it is not a claim that will sustain extended discussion. This claim is the type of claim that might be appropriate for the conclusion of a paper, but in the beginning of the paper, the student is left with nowhere to go. What further points can be made? If there are "always alternatives" to the problem the student is identifying, then why bother developing a paper around that claim? Ideally, a thesis statement should be complex enough to explore over the length of the entire paper.

Better: The most effective treatment plan for methamphetamine addiction may be a combination of pharmacological and cognitive therapy, as argued by Baker (2008), Smith (2009), and Xavier (2011).

In the revised thesis, you can see the student make a specific, debatable claim that has the potential to generate several pages' worth of discussion. When drafting a thesis statement, think about the questions your thesis statement will generate: What follow-up inquiries might a reader have? In the first example, there are almost no additional questions implied, but the revised example allows for a good deal more exploration.

Thesis Mad Libs

If you are having trouble getting started, try using the models below to generate a rough model of a thesis statement! These models are intended for drafting purposes only and should not appear in your final work.

• In this essay, I argue ____, using ______ to assert _____.
• While scholars have often argued ______, I argue______, because_______.
• Through an analysis of ______, I argue ______, which is important because_______.

Words to Avoid and to Embrace

When drafting your thesis statement, avoid words like explore, investigate, learn, compile, summarize , and explain to describe the main purpose of your paper. These words imply a paper that summarizes or "reports," rather than synthesizing and analyzing.

Instead of the terms above, try words like argue, critique, question , and interrogate . These more analytical words may help you begin strongly, by articulating a specific, critical, scholarly position.

Read Kayla's blog post for tips on taking a stand in a well-crafted thesis statement.

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Didn't find what you need? Email us at [email protected] .

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Primary and Secondary Sources

Primary sources.

Primary sources are original materials on which research is based. They are firsthand testimony or direct evidence concerning a topic under consideration. They present information in its original form, neither interpreted nor condensed nor evaluated by other writers.

Whether a source if primary can be determined by the way it is being used by the researcher. For example, a speech about the Declaration of Independence that was delivered by a noted statesman on its hundredth anniversary would be secondary source for a scholar studying the document’s philosophical origins. But it would be a primary source for a scholar studying how the Declaration’s meaning has changed for Americans over time. Examples:

• Newspaper articles (reporting events)
• Photographs
• Interviews (legal proceedings, personal, telephone, e-mail)
• Correspondence
• Trial transcripts
• Fiction, poems, music
• Experimental results
• Autobiographies, personal narratives, memoirs
• Manuscripts

Secondary Sources

Secondary sources offer interpretation or analysis based on primary sources. They may explain primary sources and often uses them to support a specific thesis or argument or to persuade the reader to accept a certain point of view. Such works are one or more steps removed from the event—being written with the benefit of hindsight.

• Journal articles
• Encyclopedias
• Dissertations
• Research analysis
• Works of criticism and interpretation
• Newspaper articles (analyzing news)

Differentiating between primary and secondary sources

• Time of publication. Material written close to the time of the event is often primary material. For instance, a diary written a women traveling on the Oregon Trail is primary material as is an article in the newspaper at the time of her arrival in Portland. However, a contemporary article about the hardships of the trip along the Trail would be secondary material.
• Purpose of the material. An article, book, essay, etc. written with an analytical or persuasive point of view is secondary. The latest population data for New York Counties are primary material; an article describing trends and analyzing the data is secondary.
• Context of the researching scholar. Primary materials for a critic studying the literature of Desert Storm, the first Iraq War, differ significantly from primary materials for a physician studying the health problems of the soldiers in that war. The critic’s primary materials are the stories, poems, songs of the era. The physician would study the soldiers’ medical records.
• Primary and secondary sources are not fixed categories. The use of evidence as primary or secondary is determined by the type of research you are conducting.

Definitions for primary and secondary resources vary from discipline to discipline, check with your professor for help specific to your assignment or discipline.

Some comparative examples of primary and secondary sources:

History: Primary Source Research: Step 2: Developing a Thesis Statement

• Step 1: Identifying Primary Sources
• Digital Collections for Primary Sources
• Step 2: Developing a Thesis Statement
• Step 3: Gathering Secondary Sources
• Database Researching Tips: Boolean Operators
• Step 4: Creating a Bibliography

Forming a Thesis Statement

If you have identified your research topic, and you have gathered primary source materials, it's time to formulate a thesis statement. Remember, a thesis has a definable, arguable claim.  It's not a question, a list of points, a hypothetical "what-if" argument, or restatement of someone else's ideas. It's YOUR argument for or against something. 

I like to think of it as a math problem:  A + B = C.  You probably have two ideas (A+B) that, when filtered through the lens of your primary source research, creates a final argument or new interpretation (C). The equation could also be stated this way:  Point A, because of point B, lead to argument C.

If you would like further assistance with thesis statements or writing papers in general, the Writing Center is available on the second floor of the Library.  The tutors are more than happy to help you and are available anytime from 9 a.m. to 8 p.m. Monday through Thursday, or 9 a.m. to 5 p.m. on Friday. 

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Information

Primary sources.

• What is a Primary Source
• Locating Primary Source Materials
• Using Primary Sources
• Digital Primary Sources
• Historic Newspapers
• Historic Census Data and Statistics

What is a Primary Source?

Definition of Primary Sources:  

A primary source is a piece of evidence created during the time you are studying. These sources offer an eye-witness view of a particular event. They can be any type of format, as long as you as the researcher are looking for the source's context: Who made this, and what was their perspective? What other sources describe the same events? Whose perspective isn't represented, and where can you find it? What was the world like when this thing was made? With primary sources, you will ask a lot of questions!

Some common types of records used as primary sources include:

• Original Documents , including eyewitness accounts or the first record of events such as diaries, speeches, letters, manuscripts, interviews, news film footage, autobiographies, or official records
• Creative Works such as literature, music, art, film, etc.
• Relics or Artifacts such as pottery, furniture, clothing, and buildings
• Data from original research whether statistical or scientific

Remember: you have to find context for your primary sources.

What is a Secondary Source?

Definition of a secondary source:.

A secondary source interprets and analyzes primary sources. Secondary sources may have pictures, quotes or graphics of primary sources in them. Some common types of secondary sources include:

• A journal/magazine article which interprets or reviews previous findings 
• A history textbook 
• A book about the effects of WWI 
• Biographies
• Encyclopedia articles

Remember: a secondary source is making an argument based on research from other primary and secondary sources.

Primary Sources by Discipline

Different academic disciplines have different definitions of what constitutes a primary source:.

In the Humanities (history, literature, religion), primary sources focus on original documents or accounts contemporary to a specific event or an individual’s life. Terms such as “eyewitness” or “firsthand” are also commonly used to describe these sources. Autobiographical accounts written at a later date are also considered primary sources. Letters, diaries, journal entries, public records as well as contemporaneous newspapers articles offer solid examples of this type of primary source. Fictional works such as short stories or novels written during that specific time period constitute primary documents, too.

In the Arts (art, dance, music, theatre), primary sources are as diverse as the various disciplines in the category. They may include paintings, sculpture, prints, performances, video or audio recordings, scripts, or musical scores. Social Sciences (psychology, sociology, education) place a heavy emphasis on unanalyzed data sets as primary sources. Numerical data sets such as census figures, opinion polls, surveys or interview transcripts constitute this type of raw, uninterpreted data. A researcher’s field notes are also primary sources in the social sciences. In the Sciences (biology, ecology, chemistry), primary source documents focus on original research, ideas, or findings published in academic journals. These articles mark the first publication of such research; and they detail the researcher’s methodology and results. Plant or mineral samples and other artifacts are primary sources as well.

In STEM fields , primary sources may include papers or proceedings from scientific conferences; journal articles sharing original research, technical reports, patents, lab notes, and researcher correspondence or diaries.

Portions borrowed from Berea College Hutchins Library

• Next: Locating Primary Source Materials >>

Is it a primary source?

Are you using a primary source?

It depends on the questions you're asking!

Primary Resources Presentation Slides

Primary vs. secondary sources, differentiating primary and secondary sources in each discipline.

While primary sources offer a firsthand account, secondary sources are written after the fact. Secondary sources analyze, interpret, explain, or analyze a primary source, event or individual. These resources represent a second publication cycle, tasked with presenting an argument or to persuade the reader.

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Library Research Guide for the History of Science: Introduction

• What is a Primary Source?
• Senior Theses 2023
• Background and Context/Biography
• Exploring Your Topic
• Using HOLLIS
• What is a Secondary Source?

Page Contents

Knowing a primary source when you see one, kinds of primary sources, find primary sources in hollis, using digital libraries and collections online, using bibliographies.

• Exploring the Special Collections at Harvard
• Citing Sources & Organizing Research

Primary sources provide first-hand testimony or direct evidence concerning a topic under investigation. They are created by witnesses or recorders who experienced the events or conditions being documented.

Often these sources are created at the time when the events or conditions are occurring, but primary sources can also include autobiographies, memoirs, and oral histories recorded later.

Primary sources are characterized by their content, regardless of the format available. (Handwritten notes could be published; the published book might be digitized or put on microfilm, but those notes are still primary sources in any format).

Some types of primary sources:

• Original documents (excerpts or translations acceptable): Diaries, speeches, manuscripts, letters, interviews, news film footage, contemporary newspaper articles, autobiographies, official records, pamphlets, meeting notes, photographs, contemporary sketches
• Creative works : Poetry, drama, novels, music, art 
• Relics or artifacts : Furniture, clothing, buildings

Examples of primary sources include:

• A poster from the Brotherhood of Sleeping Car Porters' 1962 strike
• The papers of William James
• A 1970 U.S. State Dept document updating Nixon on U.S.-Soviet space cooperation activities (Harvard login)
• A British pamphlet: "Electric Lighting for Country Houses," 1898
• Phineas Gage's skull
• The text of J. Robert Oppenheimer's "Atomic Weapons" presentation to the American Philosophical Society

Outline of Primary Sources for History

Archives and Manuscripts

Archives and manuscripts are the unpublished records of persons (letters, notes, diaries, etc.) and organizations. What are Archives?   Usually each archival collection has a (short) catalog record and a detailed finding aid (which is often available online).

• "Catalog record” refers to the kind of record found in library online catalogs, similar to those for books, although often a bit longer. Example of an Archive record .
• “Finding aid” (sometimes called an inventory) generally refers to a list of the folder labels for the collection, accompanied by a brief collection overview (scope and contents note) and a biographical (or institutional) note on the creator of the collection.  Finding aids may be as long as needed given the size of the collection.  They vary considerably according to the practices of individual repositories. Example of a Finding aid .

To find  Archives and manuscripts  at Harvard, go to  HOLLIS Advanced search .  Search your keywords or Subject terms (see the  HOLLIS page of this guide ) in the Library Catalog, limiting to Resource Type: Archives/Manuscripts.  You can choose the library at the right (Search Scope).  Countway  Medicine has abundant medical archives, and Schlesinger has many archives of women activists, many in health and reproductive rights fields.    Sample search on Subject: Women health .

Library Research Guide for Finding Manuscripts and Archival Collections explains

• How to find archives and manuscripts at Harvard
• How to find archives and manuscripts elsewhere in US via search tools and via subject guides .
• How to find archives and manuscripts in Europe and elsewhere.
• Requesting digitization of archival material from Harvard and from other repositories .

For digitized archival material together with other kinds of primary sources:

• Finding Primary Sources Online offers general instructions for finding primary sources online and a list of resources by region and country
• Online Primary Source Collections for the History of Science lists digital collections at Harvard and beyond by topic.
• Online Primary Source Collections for History lists digital collections at Harvard and beyond by topic.

Methods for finding books are described under the HOLLIS page  of this guide and in the Finding Primary Sources in HOLLIS box on this page. 

• Book Reviews may give an indication as to how a scientific work was received. See:   Finding Book Reviews . 
• Numerous, especially pre-1923 books (as well as periodicals and other sources) can be found and full text searched in several digital libraries (see box on this page).

Periodicals

Scientific articles :

Web of Science Citation Indexes (Harvard Login)  (1900- ) articles in all areas of science. Includes medical articles not in PubMed. You can use the Cited Reference search in the Web of Science to find primary source articles that cite a specified article, thus getting an idea of its reception. More information on the Web of Science .

PubMed (1946- ) covers, usually with abstracts, periodical articles on all areas of medicine. - --Be sure to look at the MeSH (Medical Subject Headings)  at the bottom of pertinent records. Very recent articles may not as yet received their MeSH terms.  So look at older records to find the MeSH terms, and use a variety of keywords as well as MeSH terms to find the new records. --​The MeSH terms are the same as the Medical Subject terms found in HOLLIS. --Hit Free article or Try Harvard Library, not the publisher's name to see full text

JSTOR (Harvard Login)  offers full-text of complete runs (up to about 5 years ago) of over 400 journals. JSTOR allows simultaneous or individual searching, full-text searching optional, numerous journals in a variety of fields of science and medicine. See the list at the bottom of the Advanced search screen. JSTOR searches the "Notes and News" sections of journals ( Science is especially rich in this material). In Advanced Search choose Item Type: Miscellaneous to limit largely to "Notes and News".

PsycINFO) (Harvard Login)  (1872- ) indexes the professional and academic literature in psychology and related disciplines

Many more scientific periodical indexes are listed in the Library Research Guide for the History of Science .

General interest magazines and periodicals see:

American Periodicals Series Online (Harvard Login)  (1740-1900) offers full text of about 1100 American periodicals. Includes several scientific and medical journals including the American Journal of Science and the Medical Repository. In cases where a periodical started before 1900, coverage is included until 1940.

British Periodicals (Harvard Login)  (1681-1920) offers full text for several hundred British periodicals.

Ethnic NewsWatch (Harvard Login)  (1959- ) is a full text database of the newspapers, magazines, and journals of the ethnic, minority and native press.

Periodicals Index Online (Harvard Login)  indexes contents of thousands of US and European journals in the humanities and social sciences, from their first issues to 1995.

Reader's Guide Retrospective (WilsonWeb) (Harvard Login)  (1890-1982)  indexes many American popular periodicals.

Many more general periodical indexes are listed in Finding Articles in General and Popular Periodicals (North America and Western Europe) .

Articles in non-science fields (religion, public policy): see the list in the Library Research Guide for History .

Professional/Trade : Aimed at particular trades or professions.  See the Library Research Guide for History

Newspaper articles : see the Guide to Newspapers and Newspaper Indexes .

Personal accounts . These are first person narratives recalling or describing a person’s life and opinions. These include Diaries, memoirs, autobiographies, and when delivered orally and recorded: Oral histories and Interviews.

National Library of Medicine Oral Histories

Regulatory Oral History Hub  (Kenan Institute for Ethics, Duke University) offers links to digital collections containing interviews with regulators, lawyers, and judges. Mainly U.S.

Visual sources :

Records for many, but by no means all, individual Harvard University Library images are available in  HOLLIS Images , an online catalog of images. Records include subjects and a thumbnail image.  HOLLIS Images is included in HOLLIS  searches.

Science & Society Picture Library offers over 50,000 images from the Science Museum (London), the National Museum of Photography, Film & Television and the National Railway Museum.

Database of Scientific Illustrators  (DSI) includes over 12500 illustrators in natural history, medicine, technology and various sciences worldwide, c.1450-1950. Living illustrators excluded. 

NYPL Digital Gallery Pictures of Science: 700 Years of Scientific and Medical Illustration

Images from the History of Medicine (IHM) includes prints and photographs from the U.S. National Library of Medicine. (The IHM is contained within a larger NLM image database, so this link goes to a specialized search).

Images From the History of the Public Health Service: a Photographic Exhibit .

Wellcome Images

Films/Videos

To find films in  HOLLIS , search your topic keywords, then on the right side of the results screen, look at Resource Type and choose video/film.

To find books about films about your topic, search your topic keywords AND "in motion pictures" ​  (in "")

​Film Platform  offers numerous documentary films on a wide variety of subjects.  There are collections on several topics. Searches can be filtered by topic, country of production, and language. 

A list of general sources for images and film is available in the Library Research Guide for History and additional sources for the history of science in Library Research Guide for the History of Science .

Government documents often concern matters of science and health policy.  For Congressional documents, especially committee reports, see ProQuest Congressional (Harvard Login ). 

HathiTrust Digital Library . Each full text item is linked to a standard library catalog record, thus providing good metadata and subject terms. The catalog can be searched separately.  Many government documents are full text viewable.  Search US government department as Author.

More sources are listed in the Library Research Guide for History

For artifacts and other objects , the Historic Scientific Instruments Collection in the Science Center includes over 15,000 instruments, often with contemporary documentation, from 1450 through the 20th century worldwide.

Waywiser, online database of the Collection of Historical Scientific Instruments .

Warren Anatomical Museum of the Center for the History of Medicine in the Countway Library of Medicine has a rich collection of medical artifacts and specimens.

Peabody Museum of Archaeology and Ethnology

Fall 2020: these collections are closed during the pandemic. Check out their links above to see what they have available online.

Primary Source Terms :

You can limit HOLLIS  searches to your time period, but sources may be published later, such as a person's diary published posthumously. Find these with these special Subject terms.

You can use the following terms to search HOLLIS for primary sources:

• Correspondence
• Description and travel
• Manuscripts
• Notebooks, sketchbooks, etc.
• Personal narratives (refers to accounts of wars and diseases only)
• Pictorial works
• Sources (usually refers to collections of published primary sources)

Include these terms with your topical words in HOLLIS searches. For example: tuberculosis personal narratives

Online Primary Source Collections for the History of Science lists digital collections at Harvard and beyond by topic

Google Book Search, HathiTrust Digital Library and Internet Archives offer books and periodicals digitized from numerous libraries.  Only out-of-copyright, generally post-1923, books are fully viewable.  Each of these three digital libraries allows searching full text over their entire collections.

Google Book Search

HathiTrust Digital Library . Each full text item is linked to a standard library catalog record, thus providing good metadata and subject terms. The catalog can be searched separately.  Many post-1923 out-of-copyright books, especially government documents, are full text viewable. You can search within copyright books to see what page your search term is on.

Internet Archive now offers a beta full text search. Put your terms (phrases or personal names, in quotation marks (""), work best) in the search box. 

The Online Books Page arranges electronic texts by Library of Congress call numbers and is searchable (but not full text searchable).  Includes books not in Google Books, HathiTrust, or Internet Archive. Has many other useful features.

Medical Heritage Library . Information about the Medical Heritage Library. Now searchable full text.

UK Medical Heritage Library

Biodiversity Heritage Library

Contagion: Historical Views of Diseases and Epidemics (1493-1922) provides digitized historical, manuscript, and image resources selected from Harvard University libraries and archives.

Expeditions and Discoveries (1626-1953) features nine expeditions in anthropology and archaeology, astronomy, botany, and oceanography in which Harvard University played a significant role. Includes manuscripts and records, published materials, visual works, and maps from 14 Harvard repositories.

Defining Gender Online: Five Centuries of Advice Literature for Men and Women (1450-1910).

Twentieth Century Advice Literature: North American Guides on Race, Sex, Gender, and the Family.

Many more general History digital libraries and collections: Library Research Guide for History

More History of Science digital libraries: Library Research Guide for the History of Science .

There may already be a detailed list of sources (a bibliography) for your topic.

For instance:

A bibliography of eugenics , by Samuel J. Holmes ... Berkeley, Calif., University of California press, 1924, 514 p. ( University of California publications in zoology . vol. XXV)  Full text online .

Look for specialized subject bibliographies in HOLLIS Catalog . Example .   WorldCat can do similar searches in the Subject Keyword field for non-Harvard holdings.

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Princeton University Library

History senior thesis survival guide, introduction, a general strategy for finding primary sources.

• Finding primary sources at Princeton
• Finding primary sources elsewhere
• Primary source guides
• Practical advice
• Finding bibliographies
• Finding book reviews
• Historiography for beginners
• Footnotes made easy This link opens in a new window

Research methods

It may benefit you to look at some resources that provide an overview into the techniques of historical research.

Sage Research Methods  ("Browse" by discipline, look for History) provides a number of handbooks and case studies.

A catalog search on the subject History--Methodology will provide a number of useful books.

About primary sources

Whether you are beginning a junior paper, a senior thesis, or a doctoral dissertation in history, the first challenge is to identify a cache of primary source material that addresses the issue, person, place, or period that interests you. This guide offers some general suggestions about how to get started.

Primary sources can be either published or unpublished, and can be found in many formats, such as manuscripts, books, microfilm, photographs, video and sound recordings. Some primary sources are available in more than one format -- for example, a collection of manuscript letters may also have been published in book form, or may have been digitized and made available on the Internet. Begin by asking two basic questions:

What evidence was created?

What evidence was saved, and where.

For the most part, the evidence used by historians to answer historical questions was not created for that purpose. The evidence of the past -- official records, personal papers, videorecordings, physical remains -- was created to serve the purposes of people with very different agendas. Nonetheless, it is very useful to think about some broad categories of evidence, in part because understanding these categories can help you find the material you need.

• The records and publications of governments
• The records and publications of organizations
• The papers of individuals
• Material culture -- buildings, artifacts, and art

It is particularly useful to consider whether the material you need would have been published (newspapers, books) or would have had a more limited circulation (intra-office memos, personal correspondence, a private photo album.)

Think about who might have collected the material you're hoping to find:

• Published primary sources like newspapers, books, and government reports are likely to be held in libraries.
• Unpublished documents and administrative records produced by national government agencies are likely to be held in national archives; those produced by local administrations are likely to be held in municipal record offices or state archives.
• Materials produced by an organization or business will likely be held by that organization if it still exists; if it no longer exists, look for an affiliated organization or a library or archive that collects material on that topic.
• Personal papers, diaries, and materials related to local history are likely to be held in local libraries or historical societies.
• Museum, archives and libraries all have collections of art and artifacts as well a written records.

Some examples:

• The records of the U.S. federal government are held at the National Archives .
• The records of the New York City government are at the New York City Municipal Archive s (but much other important material on NYC is at the New York Public Library or the New-York Historical Society.)
• The personal papers of Harry Truman are held at the Harry S. Truman Library in Independence, Missouri.
• The records of the British East India Company are held at the British Library .
• The records of the Triangle Club are at the University Archives at Princeton.

Finally, keep in mind that the material you need may be scattered among several libraries and archives.

• Consult the bibliography, notes and acknowledgments in a good, recent secondary work on the subject that interests you -- does the writer tell you where the primary sources can be found?
• If you still haven't found that person's papers, search Worldcat for that person as an Author. You will find both published and unpublished material by that person.
• Can you identify an organization that was involved in the events you are studying? Search Worldcat for that organization as an Author.
• Search ArchiveGrid or Archive Finder , two databases that list archival collections in the U.S. and elsewhere.
• To find printed subject guides to archival resources in the library catalogs, do a keyword search for a subject term plus archiv?, e.g. brewing and archiv?
• Google your topic, using words like "papers" or "archives" as part of your search.
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• Last Updated: Dec 19, 2023 1:59 PM
• URL: https://libguides.princeton.edu/history/seniorthesis

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BROADBAND AND MULTI-SCALE ELECTROMAGNETIC SOLVER USING POTENTIAL-BASED FORMULATIONS WITH DISCRETE EXTERIOR CALCULUS AND ITS APPLICATIONS

A novel computational electromagnetic (CEM) solver using potential-based formulations and discrete exterior calculus (DEC) is proposed. The proposed solver consists of two parts: the DEC A-Phi solver and the DEC F-Psi solver. A and Phi are the magnetic vector potential and electric scalar potential of the electromagnetic (EM) field, respectively; F and Psi are the electric vector potential and magnetic scalar potential, respectively. The two solvers are dual to each other, and most research is carried out with respect to the DEC A-Phi solver.

Systematical approach for constructing the DEC A-Phi matrix equations is provided in this thesis, including the construction of incidence matrices, Hodge star operators and different boundary conditions. The DEC A-Phi solver is proved to be broadband stable from DC to optics, while classical CEM solvers suffer from stability issues at low frequencies (also known as the low-frequency breakdown). The proposed solver is ideal for broadband and multi-scale analysis, which is of great importance in modern industry.

To empower the proposed solver with the ability to solve industry problems with large number of unknowns, iterative solvers are preferred. The error-minimization mechanism buried in iterative solvers allows user to control the effect of numerical error accumulation to the solution vector. Proper preconditioners are almost always needed to accelerate the convergence of iterative solvers in large scale problems. In this thesis, preconditioning schemes for the proposed solver are studied.

In the DEC A-Phi solver, current sources can be applied easily, but it is difficult to implement voltage sources. To incorporate voltage sources in the potential-based solver, the DEC F-Psi solver is proposed. The DEC A-Phi and F- Psi solvers are dual formulations to each other, and the construction of the F-Psi solver can be generalized from the A-Phi solver straightforward.

Degree Type

• Doctor of Philosophy
• Electrical and Computer Engineering

Campus location

• West Lafayette

Advisor/Supervisor/Committee Chair

Additional committee member 2, additional committee member 3, additional committee member 4, usage metrics.

• Engineering electromagnetics