Beer, H. d. (2009). Little polar bear and the whales. North-South ; Publishers Group UK [distributor].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBeer, Hans de. Little Polar Bear and the Whales. New York : Enfield: North-South ; Publishers Group UK [distributor], 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBeer, Hans de. Little Polar Bear and the Whales. North-South ; Publishers Group UK [distributor], 2009.
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