APA (7th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. (1979). Trails West. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. Trails West. Washington: National Geographic Society, 1979.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. Trails West. National Geographic Society, 1979.

Warning: These citations may not always be 100% accurate.