APA (7th ed.) Citation

National Geographic Society (U.S.). (1935). Cumulative index to the National geographic magazine, 1899 to 1934, inclusive. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Cumulative Index to the National Geographic Magazine, 1899 to 1934, Inclusive. Washington, D.C.: National Geographic Society, 1935.

MLA (8th ed.) Citation

National Geographic Society (U.S.). Cumulative Index to the National Geographic Magazine, 1899 to 1934, Inclusive. National Geographic Society, 1935.