APA-Zitierstil (7. Ausg.)

National Geographic Society. (2006). National Geographic guide to the national parks of the United States (5. ed., completely updated.).

Chicago-Zitierstil (17. Ausg.)

National Geographic Society. National Geographic Guide to the National Parks of the United States. 5. ed., completely updated. Washington, DC, 2006.

MLA-Zitierstil (9. Ausg.)

National Geographic Society. National Geographic Guide to the National Parks of the United States. 5. ed., completely updated. 2006.

Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.