Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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