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Oklahoma Environmental History

Originally created for Dr. Brosnan's American Environmental History class Fall 2013

Secondary Sources

Secondary sources are materials written by historians using primary sources (such as government reports, newspaper articles, memoirs, etc.) Examples of secondary sources include:

  • books
  • journal articles
  • encyclopedia articles

See the boxes below for resources to help you find different types of secondary sources.

TIP: Because historians cite their primary sources, look at the bibliographies in their books and articles to locate sources for your own paper!

Books and More

Journal Articles


Do NOT use encyclopedias as your only source. DO use encyclopedias as a starting point for background information and sources for further reading.