Williams, K. (2021). The loneliest Polar bear: A true story of survival and peril on the edge of a warming world (First edition.). Crown.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Kale. The Loneliest Polar Bear: A True Story of Survival and Peril on the Edge of a Warming World. First edition. New York: Crown, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Kale. The Loneliest Polar Bear: A True Story of Survival and Peril on the Edge of a Warming World. First edition. Crown, 2021.
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