APA (7th ed.) Citation

Abell, G. O., Morrison, D., & Sidney, W. (1992). Realm of the universe. Sounders College.

Chicago Style (17th ed.) Citation

Abell, George O., David Morrison, and Wolff Sidney. Realm of the Universe. Sounders College, 1992.

MLA (8th ed.) Citation

Abell, George O., et al. Realm of the Universe. Sounders College, 1992.