APA (7th ed.) Citation

Abell, G. O. (1982). Exploration of the universe (4th ed.). Saunders College Pub.

Chicago Style (17th ed.) Citation

Abell, George O. Exploration of the Universe. 4th ed. Philadelphia: Saunders College Pub, 1982.

MLA (9th ed.) Citation

Abell, George O. Exploration of the Universe. 4th ed. Saunders College Pub, 1982.