Cita APA (7th ed.)
Abell, G. O., Marrison, D., & Wolff, S. C. (1992). Realm of the Universe (5th ed.). Saunders College.
Cita Chicago (17th ed.)
Abell, George O., David Marrison, i Sidney C. Wolff. Realm of the Universe. 5th ed. New York: Saunders College, 1992.
Cita MLA (9th ed.)
Abell, George O., et al. Realm of the Universe. 5th ed. Saunders College, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.