Helzer, Chris, author
The Ecology and management of prairies in the central United States
University of Lowa press, 2010
 Buku Teks
Twesten, Gary, author
Wildlife ecology; a guide to the ecological approach of studying the wildlife of the central United States
Illinois Record Printing, 1989
 Buku Teks
Harlow, Ralph Volney, author
The United States
Holt, Rinehart and Wiston, 1961
 Buku Teks
Harlow, Ralph Volney, author
The United States
Holt, Rinehart and Wiston, 1961
 Buku Teks
United states
 Buku Teks
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