APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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