Cita APA (7a ed.)

Diamond, J. M. (2017). Guns, germs, and steel: The fates of human societies (20th Anniversary edition.). W.W. Norton & Company, Inc.

Cita Chicago Style (17a ed.)

Diamond, Jared M. Guns, Germs, and Steel: The Fates of Human Societies. 20th Anniversary edition. New York, NY: W.W. Norton & Company, Inc, 2017.

Cita MLA (9a ed.)

Diamond, Jared M. Guns, Germs, and Steel: The Fates of Human Societies. 20th Anniversary edition. W.W. Norton & Company, Inc, 2017.