APA-referens (7:e uppl.)

Johnston, D. W. (1961). The biosystematics of American Crows. University of Washington.

Chicago-referens (17:e uppl.)

Johnston, David W. The Biosystematics of American Crows. Washington: University of Washington, 1961.

MLA-referens (9:e uppl.)

Johnston, David W. The Biosystematics of American Crows. University of Washington, 1961.