Ziefert, H., & Bolam, E. (1998). A polar bear can swim: What animals can and cannot do. Viking.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रZiefert, Harriet, और Emily Bolam. A Polar Bear Can Swim: What Animals Can and Cannot Do. New York: Viking, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रZiefert, Harriet, और Emily Bolam. A Polar Bear Can Swim: What Animals Can and Cannot Do. Viking, 1998.
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