Primary vs. Secondary Sources

Is the source a primary or secondary source?

Primary sources provide information directly from a source. Examples of primary soruces include:

  • Historical documents
  • autobiographies (written by the sources themselves)
  • information gathered from interviews or questionnaires

Because these sources are primary, you can know that they reflect what the writer chose to write at the time, but keep in mind that the information in these sources may or may not be accurate and well-reasoned. The Declaration of Independence and Mein Kampf are primary sources, as are any of Thomas Jefferson's notes about the drafting process or any of Adolph Hitler's architectural sketches.

Here are some questions that may help you evaluate your primary sources:

  • What was the situation that prompted the writer to compose this document?
  • What was the writer's source of information, motivation for writing, and biases?
  • What other primary sources might expand, clarify, or contradict this document?

Secondary sources provide information indirectly, through authors who have made judgments about the quality of the primary and secondary information they have used. You must evaluate how well-informed and unbiased these judgments were. A historian's recounting of research on the process of change in government or a psychologist's use of Freudian psychology to analyze Hitler's personality would be examples of secondary sources.

Here are some questions that may help you evaluate your secondary sources:

  • What is the writer's expertise in this field?
  • What motivated the writer to compose this document?
  • How is this person evaluated by others who are known to be experts in the field?
  • What is the argument this writer is making about the topic?
  • What contradictions do other sources offer? How credible are they?
  • How is this book or article evaluated by others in the field?
  • Is the information current? Contemporary to the event?



NOTE: The importance of the timeliness of the information for your research will depend on the nature of your research. For some research projects, documents published decades ago would still be of value; in fact, in some cases such material would be essential. If, however, advances are being made on a topic, your information will need to be as current as possible. Keep in mind that if your subject is current, your information should be current.

For more help - Make an Appointment!


Condensed from materials prepared by Mary McMullen-Light, Writing Specialist, and Chip Dube, Instructional Support Specialist, Longview Community College, Lee's Summit, Missouri.
Revised: 07/11


The University of Kansas prohibits discrimination on the basis of race, color, ethnicity, religion, sex, national origin, age, ancestry, disability, status as a veteran, sexual orientation, marital status, parental status, gender identity, gender expression and genetic information in the University’s programs and activities. The following person has been designated to handle inquiries regarding the non-discrimination policies: Director of the Office of Institutional Opportunity and Access, IOA@ku.edu, 1246 W. Campus Road, Room 153A, Lawrence, KS, 66045, (785)864-6414, 711 TTY.