Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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