National Geographic Society (U.S.). Book Division. National Geographic guide to the national parks of the United States. National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.). Book Division. National Geographic Guide to the National Parks of the United States. Washington, D.C.: National Geographic Society.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.). Book Division. National Geographic Guide to the National Parks of the United States. National Geographic Society.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.