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Primary, Secondary, & Tertiary Sources: What is a Tertiary Source?

What are Tertiary Sources?

Tertiary Sources

Tertiary sources offer a summary of a topic, event or condition and include primary and secondary sources. Indexes that guide users to specific locations within a book or source are also considered tertiary.  Many reference books are considered tertiary sources.

Tertiary sources include:

  • Almanacs
  • Bibliographies
  • Chonologies
  • Indexes
  • Manuals
  • Textbooks

 Some sources are both secondary and tertiary like dictionaries and encyclopedias.

Visit this Page for More Tertiary Sources

Examples from the Library Collection


James A. Cannavino Library

3399 North Road
Poughkeepsie, NY 12601
(845) 575-3106