APA (7th ed.) Citation

Kaufmann, W. J. (1990). Discovering the universe (2. ed.). Freeman.

Chicago Style (17th ed.) Citation

Kaufmann, William J. Discovering the Universe. 2. ed. New York: Freeman, 1990.

MLA (9th ed.) Citation

Kaufmann, William J. Discovering the Universe. 2. ed. Freeman, 1990.