APA (7th ed.) Citation

National Geographic Society (U.S.). (1979). Trails west. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Trails West. Washington, D.C: National Geographic Society, 1979.

MLA (8th ed.) Citation

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

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