Cita APA (7a ed.)
Garret, W. E. National Geographic: Vol. 176, no. 6, December 1989. National Geographic Society.
Cita estilo Chicago (17a ed.)
Garret, Wilbur E. National Geographic: Vol. 176, No. 6, December 1989. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Garret, Wilbur E. National Geographic: Vol. 176, No. 6, December 1989. National Geographic Society.
Precaución: Estas citas no son 100% exactas.