National Geographic Society. (1981). Atlas of the world (5a. ed.). National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Society. Atlas of the World. 5a. ed. Washington, D.C: National Geographic Society, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Geographic Society. Atlas of the World. 5a. ed. National Geographic Society, 1981.
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