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Thurber, J. M.; Peterson, R. O. (1993). “Effects of Population Density and Pack Size on the Foraging Ecology of Gray Wolves”. Journal of Mammalogy74 (4): 879. doi:10.2307/1382426. JSTOR1382426.
Smith, D. W.; Trauba, D. R.; Anderson, R. K.; Peterson, R. O. (1994). “Black bear predation on beavers on an island in Lake Superior”. American Midland Naturalist132 (2): 248–255. doi:10.2307/2426580. JSTOR2426580.
Müller-Schwarze, D.; Heckman, Susan (1980-01-01). “The social role of scent marking in beaver (Castor Canadensis)” (英語). Journal of Chemical Ecology6 (1): 81–95. doi:10.1007/BF00987529. ISSN1573-1561.