APA-referens (7:e uppl.)
LIFE-HISTORIES of North American cardinals, grosbeaks, buntings, towhees, finches, sparrows, and allies.
Chicago-referens (17:e uppl.)
LIFE-HISTORIES of North American Cardinals, Grosbeaks, Buntings, Towhees, Finches, Sparrows, and Allies.
MLA-referens (9:e uppl.)
LIFE-HISTORIES of North American Cardinals, Grosbeaks, Buntings, Towhees, Finches, Sparrows, and Allies.
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