Cita APA

Boyd, R., & Silk, J. B. (1997). How humans evolved. New York: W. W. Norton.

Chicago Style Citation

Boyd, Robert., i Joan B. Silk. How Humans Evolved. New York: W. W. Norton, 1997.

Cita MLA

Boyd, Robert., i Joan B. Silk. How Humans Evolved. New York: W. W. Norton, 1997.