Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Precaución: Estas citas no son 100% exactas.