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Lehigh University Libraries - Library Guides

Research Process: A Step-By-Step Guide: 3b. Primary vs. Secondary

Source Types

When evaluating information, it is useful to identify if it's a Primary, Secondary, or Tertiary source. By doing so, you will be able recognize if the author is reporting on his/her own first hand experiences, or relying on the views of others.

Source Type Examples
A first person account by someone who experienced or witnessed an event. The original document has not been previously published or interpreted by anyone else.
  • First person account of an event
  • First publication of a scientific study
  • Speech or lecture
  • Original artwork
  • Handwritten manuscript
  • Letters between two people
  • A diary
  • Historical documents, e.g. Bill of Rights

One step removed from the primary original source. The author is reexamining, interpreting and forming conclusions based on the information conveyed in the primary source.

  • Newspaper reporting on a scientific study
  • Review of a music CD or art show
  • Biography

Further removed from a primary source. It leads the researcher to a secondary source, rather than to the primary source.

  • Bibliography
  • Index to articles
  • Library catalog

Primary vs Secondary Sources

Posted with permission from the Univ. of California San Diego Libraries.


Search the Library Catalog to find primary source material for your topic. Try adding one of the keywords below:

  • charters
  • correspondence
  • diaries
  • documents
  • interviews
  • letters
  • manuscripts
  • oratory
  • pamphlets
  • personal narratives
  • sources
  • speeches