Cita APA (7a ed.)
Grosvenor, G. M. National Geographic: March 1977. National Geographic Society.
Cita estilo Chicago (17a ed.)
Grosvenor, Gilbert M. National Geographic: March 1977. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Grosvenor, Gilbert M. National Geographic: March 1977. National Geographic Society.
Precaución: Estas citas no son 100% exactas.