APA (7th ed.) Citation

National Geographic Society (U.S.). Cartographic Division. (1950). South America. The Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Cartographic Division. South America. Washington, D.C.: The Society, 1950.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Cartographic Division. South America. The Society, 1950.

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