Cita APA (7th ed.)

Keith, A. (1947). Evolution and ethics. New York: G.P. Putnam's Sons.

Cita Chicago (17th ed.)

Keith, Arhur. Evolution and Ethics. New York: G.P. Putnam's Sons, 1947.

Cita MLA (8th ed.)

Keith, Arhur. Evolution and Ethics. New York: G.P. Putnam's Sons, 1947.