Cita APA (7th ed.)

Boyd, R., & Silk, J. B. (2006). How humans evolved (4th ed.). W. W. Norton & Co..

Cita Chicago (17th ed.)

Boyd, Robert, i Joan B. Silk. How Humans Evolved. 4th ed. New York: W. W. Norton & Co., 2006.

Cita MLA (9th ed.)

Boyd, Robert, i Joan B. Silk. How Humans Evolved. 4th ed. W. W. Norton & Co., 2006.