Dyfyniad APA

Diamond, J. M. (1999). Guns, germs, and steel: The fates of human societies. Norton.

Dyfyniad Arddull Chicago

Diamond, Jared M. Guns, Germs, and Steel: The Fates of Human Societies. New York: Norton, 1999.

Dyfyniad MLA

Diamond, Jared M. Guns, Germs, and Steel: The Fates of Human Societies. Norton, 1999.

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