Cita APA (7a ed.)

Diamond, j. (1999). Guns, Germs, and Steel. Norton.

Cita Chicago Style (17a ed.)

Diamond, jared. Guns, Germs, and Steel. New York: Norton, 1999.

Cita MLA (9a ed.)

Diamond, jared. Guns, Germs, and Steel. Norton, 1999.