Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.