Cita APA (7th ed.)
Boyd, R., & Silk, J. B. (2003). How humans evolved (3rd ed.). Norton.
Cita Chicago (17th ed.)
Boyd, Robert, i Joan B. Silk. How Humans Evolved. 3rd ed. New York: Norton, 2003.
Cita MLA (9th ed.)
Boyd, Robert, i Joan B. Silk. How Humans Evolved. 3rd ed. Norton, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.