APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Boyd, Robert, and Joan B. Silk. How Humans Evolved. 4th ed. New York: Norton, 2006.

MLA (9th ed.) Citation

Boyd, Robert, and Joan B. Silk. How Humans Evolved. 4th ed. Norton, 2006.