Cita APA (7a ed.)
Garret, W. E. National Geographic: Vol. 172, no. 2, August 1987. National Geographic Society.
Cita estilo Chicago (17a ed.)
Garret, Wilbur E. National Geographic: Vol. 172, No. 2, August 1987. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Garret, Wilbur E. National Geographic: Vol. 172, No. 2, August 1987. National Geographic Society.
Precaución: Estas citas no son 100% exactas.