Orr, T. (2013). Polar bears. Children's Press, an imprint of Scholastic Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOrr, Tamra. Polar Bears. New York: Children's Press, an imprint of Scholastic Inc., 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOrr, Tamra. Polar Bears. Children's Press, an imprint of Scholastic Inc., 2013.
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