Schwartz, C. C.; Miller, S. D.; Haroldson, M. A. (2003). "Grizzly bear"(PDF). In Feldhamer, G. A.; Thompson, B. C.; Chapman, J. A. (eds.). Wild Mammals of North America: Biology, Management, and Conservation. Baltimore, MD.: Johns Hopkins University Press. pp. 556–586. Archived from the original(PDF) on 7 January 2014.
Schwartz, C. C.; Miller, S. D.; Haroldson, M. A. (2003). "Grizzly bear"(PDF). In Feldhamer, G. A.; Thompson, B. C.; Chapman, J. A. (eds.). Wild Mammals of North America: Biology, Management, and Conservation. Baltimore, MD.: Johns Hopkins University Press. pp. 556–586. Archived from the original(PDF) on 7 January 2014.
"Homepage"(PDF). Wildpro. Archived from the original(PDF) on 30 September 2011. Retrieved 6 July 2017.