Cita APA

National Geographic Society. (1981). The world. Washington: Cartographic Division. National Geographic.

Citación estilo Chicago

National Geographic Society. The World. Washington: Cartographic Division. National Geographic, 1981.

Cita MLA

National Geographic Society. The World. Washington: Cartographic Division. National Geographic, 1981.

Precaución: Estas citas no son 100% exactas.