National Geographic society. (1992). Beyond the horizon: Adventures in faraway lands. National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic society. Beyond the Horizon: Adventures in Faraway Lands. Washington, D.C.: National Geographic Society, 1992.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Geographic society. Beyond the Horizon: Adventures in Faraway Lands. National Geographic Society, 1992.
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