National Geographic Society (U.S.). (1989). Discover America!: A scenic tour of the fifty states. National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.). Discover America!: A Scenic Tour of the Fifty States. Washington, D.C: National Geographic Society, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.). Discover America!: A Scenic Tour of the Fifty States. National Geographic Society, 1989.
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