APA (7th ed.) Citation

National Geographic Television & Film, Lambert, T., Harrison, C., & Diamond, J. M. (2005). Guns, germs, and steel. National Geographic.

Chicago Style (17th ed.) Citation

National Geographic Television & Film, Tim Lambert, Cassian Harrison, and Jared M. Diamond. Guns, Germs, and Steel. [United States]: National Geographic, 2005.

MLA (8th ed.) Citation

National Geographic Television & Film, et al. Guns, Germs, and Steel. National Geographic, 2005.

Warning: These citations may not always be 100% accurate.