Style de citation APA (7e éd.)

National Geographic Society (U.S.). Book Division. National Geographic guide to the national parks of the United States. National Geographic Society.

Style de citation Chicago (17e éd.)

National Geographic Society (U.S.). Book Division. National Geographic Guide to the National Parks of the United States. Washington, D.C.: National Geographic Society.

Style de citation MLA (8e éd.)

National Geographic Society (U.S.). Book Division. National Geographic Guide to the National Parks of the United States. National Geographic Society.

Attention : ces citations peuvent ne pas être correctes à 100%.