APA (7th ed.) Citation

National Geographic Magazine. (1938). [Maps of the world]. National Geographic Magazine.

Chicago Style (17th ed.) Citation

National Geographic Magazine. [Maps of the World]. Washington: National Geographic Magazine, 1938.

MLA (9th ed.) Citation

National Geographic Magazine. [Maps of the World]. National Geographic Magazine, 1938.

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