Backhouse, F. (2015). Once they were hats: In search of the mighty beaver. ECW Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBackhouse, Frances. Once They Were Hats: In Search of the Mighty Beaver. Toronto, Ontario, Canada: ECW Press, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBackhouse, Frances. Once They Were Hats: In Search of the Mighty Beaver. ECW Press, 2015.
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