National Geographic Television & Film, Lambert, T., Harrison, C., & Diamond, J. M. (2005). Guns, germs, and steel. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Television & Film, Tim Lambert, Cassian Harrison, और Jared M. Diamond. Guns, Germs, and Steel. [United States]: National Geographic, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNational Geographic Television & Film, et al. Guns, Germs, and Steel. National Geographic, 2005.
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