APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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