Dyfyniad APA

Diamond, J. (1997). Guns, germs, and steel: The fates of human societies. New York: W. W. Norton & Company.

Dyfyniad Arddull Chicago

Diamond, Jared. Guns, Germs, and Steel: The Fates of Human Societies. New York: W. W. Norton & Company, 1997.

Dyfyniad MLA

Diamond, Jared. Guns, Germs, and Steel: The Fates of Human Societies. New York: W. W. Norton & Company, 1997.

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