Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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