Heacox, K. (2015). The national parks: An illustrated history. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeacox, Kim. The National Parks: An Illustrated History. Washington, D.C.: National Geographic, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHeacox, Kim. The National Parks: An Illustrated History. National Geographic, 2015.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.