Cita APA (7a ed.)

Boyd, R., & Silk, J. B. (2003). How humans evolved (3rd ed.). W.W. Norton.

Cita Chicago Style (17a ed.)

Boyd, Robert, y Joan B. Silk. How Humans Evolved. 3rd ed. New York [etc.]: W.W. Norton, 2003.

Cita MLA (9a ed.)

Boyd, Robert, y Joan B. Silk. How Humans Evolved. 3rd ed. W.W. Norton, 2003.