Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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