APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Boyd, Robert, and Joan B. Silk. How Humans Evolved. W.W. Norton & Company, 1997.