National Geographic Television & Film, Lambert, T., Harrison, C., & Diamond, J. M. (2005). Guns, germs, and steel. National Geographic.
Cita Chicago Style (17a ed.)National Geographic Television & Film, Tim Lambert, Cassian Harrison, y Jared M. Diamond. Guns, Germs, and Steel. [United States]: National Geographic, 2005.
Cita MLA (8a ed.)National Geographic Television & Film, et al. Guns, Germs, and Steel. National Geographic, 2005.
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