Nichols, M. (1993). The great apes: Between two worlds. National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNichols, Michael. The Great Apes: Between Two Worlds. Washington, D.C.: National Geographic Society, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNichols, Michael. The Great Apes: Between Two Worlds. National Geographic Society, 1993.
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