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.
Precaución: Estas citas no son 100% exactas.