Wilson, Don E. & Reeder, DeeAnn M. (toim.): Castor canadensisMammal Species of the World. A Taxonomic and Geographic Reference (3rd ed). 2005. Bucknell University. Viitattu 5.3.2011. (englanniksi)
Wilson, Don E. & Reeder, DeeAnn M. (toim.): CastorMammal Species of the World. A Taxonomic and Geographic Reference (3rd ed). 2005. Bucknell University. Viitattu 5.3.2011. (englanniksi)
Integrated Taxonomic Information System (ITIS): Castor canadensis (TSN 180212)itis.gov. Viitattu 5.3.2011. (englanniksi)
iucnredlist.org
Linzey, A.V. & NatureServe (Hammerson, G. & Cannings, S.): Castor canadensisIUCN Red List of Threatened Species. Version 2014.1. 2013. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 27.6.2014. (englanniksi)