APA-referens (7:e uppl.)

Abell, G. O., Marrison, D., & Wolff, S. C. (1992). Realm of the Universe (5th ed.). Saunders College.

Chicago-referens (17:e uppl.)

Abell, George O., David Marrison, och Sidney C. Wolff. Realm of the Universe. 5th ed. New York: Saunders College, 1992.

MLA-referens (9:e uppl.)

Abell, George O., et al. Realm of the Universe. 5th ed. Saunders College, 1992.