APA-referens (7:e uppl.)

Ballard, W. W. (1964). Comparative anatomy and embryology. The Ronald Press.

Chicago-referens (17:e uppl.)

Ballard, William W. Comparative Anatomy and Embryology. New York: The Ronald Press, 1964.

MLA-referens (9:e uppl.)

Ballard, William W. Comparative Anatomy and Embryology. The Ronald Press, 1964.