Kolbert, E. (2014). The sixth extinction: An unnatural history (First edition.). Henry Holt and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKolbert, Elizabeth. The Sixth Extinction: An Unnatural History. First edition. New York: Henry Holt and Company, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKolbert, Elizabeth. The Sixth Extinction: An Unnatural History. First edition. Henry Holt and Company, 2014.
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