Boyd, R., & Silk, J. B. (2000). How humans evolved (2nd ed.). New York: W.W. Norton.
Chicago Style aipamenaBoyd, Robert, và Joan B. Silk. How Humans Evolved. 2nd ed. New York: W.W. Norton, 2000.
MLA aipamenaBoyd, Robert, và Joan B. Silk. How Humans Evolved. 2nd ed. New York: W.W. Norton, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.