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, [9390?]
APA, 7th edition
([9390?]). 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, [9390?]