Kuhl, Heinrich (1820). "Castor Canadensis". Beiträge zur Zoologie und vergleichenden Anatomie. Frankfurt: Verlag der Hermannschen Buchhandlung. pp. 64–65.
Allen, Glover M. 1942. Newfoundland Beaver. Extinct and Vanishing Mammals of the Western Hemisphere, with the Marine Species of All the Oceans. American Committee for International Wild Life Protection. str. 62–63
Heller, Edmund. 1909. The Mammals. University of California Publications in Zoology. 5 (2, Birds and Mammals of the 1907 Alexander Expedition to Southeastern Alaska): 250–255
Bailey, Vernon; Doutt, J. Kenneth. 1942. Two New Beavers from Labrador and New Brunswick. Journal of Mammalogy. 23 (1): 86–88. doi:10.2307/1374859. JSTOR1374859
Warren, Edward R.; Hall, E. Raymond. 1939. A New Subspecies of Beaver from Colorado. Journal of Mammalogy. 20 (3): 358–362. doi:10.2307/1374265. JSTOR1374265
Bailey, Vernon; Doutt, J. Kenneth. 1942. Two New Beavers from Labrador and New Brunswick. Journal of Mammalogy. 23 (1): 86–88. doi:10.2307/1374859. JSTOR1374859
Warren, Edward R.; Hall, E. Raymond. 1939. A New Subspecies of Beaver from Colorado. Journal of Mammalogy. 20 (3): 358–362. doi:10.2307/1374265. JSTOR1374265
Jewett, S. G.; Hall, E. R. 1940. A New Race of Beaver from Oregon. Journal of Mammalogy. 21 (1): 87–89. doi:10.2307/1374665. JSTOR1374665