The National Geographic Society : and its official journal, The National geographic magazine
MLA
The National Geographic Society: and Its Official Journal, The National Geographic Magazine. [Washington, D.C.: National Geographic Society, 1940
APA, 7th edition
(1940). The National Geographic Society: and its official journal, The National geographic magazine. [Washington, D.C.: National Geographic Society
Chicago, 17th edition
The National Geographic Society: and its official journal, The National geographic magazine. [Washington, D.C.: National Geographic Society, 1940