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Research Process 101: Primary vs Secondary Sources

This guide will introduce the research method.

Primary Sources

Primary Sources - Primary sources are original materials that were created firsthand; they have not been run through the filter of interpretation.

  • Original materials that provide direct evidence or first-hand testimony of a participant or eyewitness of an event or topic.
  • 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  • Primary sources may be published or unpublished.  Unpublished sources are unique materials (e.g., family papers) often referred to as archives and manuscripts.
  • What constitutes a primary source varies by discipline. How the researcher uses the source generally determines whether it is a primary source or not.

Examples of primary sources include: 

  • pamphlets
  • photographs
  • research data
  • speeches and other documents of the time
  • journals
  • letters
  • manuscripts
  • moving pictures or video recordings
  • objects or artifacts such as works of art or ancient roads, buildings, tools, and weapons
  • audio recordings
  • contemporaneous newspaper articles
  • diaries
  • government documents
  • interviews

Secondary Sources

Secondary Sources - Secondary Sources are interpretations of information.  They interpret & evaluate primary information.

  • Works that interpret, analyze, and discuss the evidence provided by primary sources (e.g., scholarly books and articles).
  • Secondary sources are generally a second-hand account or observation at least one step removed from an event.
  • Secondary sources, however, can be considered to be primary sources depending on the context of their use. For example, Ken Burns' documentary of the Civil War is a secondary source for Civil War researchers, but a primary source for those studying documentary filmmaking.

Examples of secondary sources include:

  • Analysis & Interpretations of Original Research (reported in magazines)
  • Biographies
  • Books
  • Commentaries
  • Dissertations
  • Indexes, Abstracts, Bibliographies (used to locate primary & secondary sources)
  • Journal Articles