APA (7th ed.) Citation

Heacox, K. (2016). National Geographic the national parks: An illustrated history. National Geographic.

Chicago Style (17th ed.) Citation

Heacox, Kim. National Geographic the National Parks: An Illustrated History. Washington, D.C: National Geographic, 2016.

MLA (9th ed.) Citation

Heacox, Kim. National Geographic the National Parks: An Illustrated History. National Geographic, 2016.