National Geographic Society (U.S.) & Thompson, J. M. Washington, D.C. National Geographic Society.
Cita Chicago Style (17a ed.)National Geographic Society (U.S.) y John M. Thompson. Washington, D.C. Washington, D.C.: National Geographic Society.
Cita MLA (8a ed.)National Geographic Society (U.S.) y John M. Thompson. Washington, D.C. National Geographic Society.
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