APA-referens (7:e uppl.)

Harlow, W. M. (1957). Trees of the eastern and central United States and Canada. Dover.

Chicago-referens (17:e uppl.)

Harlow, William M. Trees of the Eastern and Central United States and Canada. Nueva York: Dover, 1957.

MLA-referens (9:e uppl.)

Harlow, William M. Trees of the Eastern and Central United States and Canada. Dover, 1957.