Dyfyniad APA

Boyd, R., & Silk, J. B. (2000). How humans evolved (2nd ed.). New York: W.W. Norton.

Dyfyniad Arddull Chicago

Boyd, Robert, và Joan B. Silk. How Humans Evolved. 2nd ed. New York: W.W. Norton, 2000.

Dyfyniad MLA

Boyd, Robert, và Joan B. Silk. How Humans Evolved. 2nd ed. New York: W.W. Norton, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.