APA (7th ed.) Citation

Heacox, K. (2015). The national parks: An illustrated history. National Geographic.

Chicago Style (17th ed.) Citation

Heacox, Kim. The National Parks: An Illustrated History. Washington, D.C.: National Geographic, 2015.

MLA (8th ed.) Citation

Heacox, Kim. The National Parks: An Illustrated History. National Geographic, 2015.

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