APA (7e ed.) Bronvermelding
Grosvenor, M. B. National Geographic: Vol. 135, no. 1, January 1969. National Geographic Society.
Chicago (17e ed.) Bronvermelding
Grosvenor, Melville Bell. National Geographic: Vol. 135, No. 1, January 1969. Washington, EUA: National Geographic Society.
MLA (9e ed.) Bronvermelding
Grosvenor, Melville Bell. National Geographic: Vol. 135, No. 1, January 1969. National Geographic Society.
Let op: Deze citaties zijn niet altijd 100% accuraat.