Citazione Stile APA (7a Edizione)

Keeton, W. T. (1973). Elements of biological science (2d ed.). Norton National Book Store.

Citazione stile Chigago Style (17a edizione)

Keeton, William T. Elements of Biological Science. 2d ed. New York, Manila: Norton National Book Store, 1973.

Citatione MLA (9a ed.)

Keeton, William T. Elements of Biological Science. 2d ed. Norton National Book Store, 1973.