APA (7th ed.) Citation

Abell, G. O. (1969). Exploration of the universe (2nd ed.). Holt, Rinehart and Winston.

Chicago Style (17th ed.) Citation

Abell, George O. Exploration of the Universe. 2nd ed. New York: Holt, Rinehart and Winston, 1969.

MLA (9th ed.) Citation

Abell, George O. Exploration of the Universe. 2nd ed. Holt, Rinehart and Winston, 1969.