Gaya APA

Boyd, R., Silk, J, B. (2011). How Humans Evolved (Sixth Edition) (Ed 6 Cet 1). New York: W.W Norton & Company.

Gaya MLA

Boyd, Robert., Silk, Joan, B.. "How Humans Evolved (Sixth Edition)". Ed 6 Cet 1 New York: W.W Norton & Company, 2011. Text.