Curtis, J. L., & Cornell, L. (2006). Is there really a human race? Joanna Cotler Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCurtis, Jamie Lee, और Laura Cornell. Is There Really a Human Race? New York, NY: Joanna Cotler Books, 2006.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCurtis, Jamie Lee, और Laura Cornell. Is There Really a Human Race? Joanna Cotler Books, 2006.
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