APA (7th ed.) Citation

Keeton, W. T. (1972). Elements of biological science (2nd ed.). W.W. Norton.

Chicago Style (17th ed.) Citation

Keeton, William T. Elements of Biological Science. 2nd ed. New York: W.W. Norton, 1972.

MLA (9th ed.) Citation

Keeton, William T. Elements of Biological Science. 2nd ed. W.W. Norton, 1972.