National Geographic Society, Washington, D.C. (1974). Research reports - National Geographic Society. National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Society, Washington, D.C. Research Reports - National Geographic Society. Washington: National Geographic Society, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Geographic Society, Washington, D.C. Research Reports - National Geographic Society. National Geographic Society, 1974.
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