Heacox, K. (2016). National Geographic the national parks: An illustrated history. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeacox, Kim. National Geographic the National Parks: An Illustrated History. Washington, D.C: National Geographic, 2016.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHeacox, Kim. National Geographic the National Parks: An Illustrated History. National Geographic, 2016.
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