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Stewart, George R. Jr. (December 1935). "Popular Names of the Mountain Sheep". American Speech. 10 (4). Duke University Press: 283–288. doi:10.2307/451603. JSTOR451603.
This article incorporates public domain material from Singer, Francis (1995). "Bighorn Sheep in the Rocky Mountain National Parks"(PDF). In Stohlgren, T.J. (ed.). The Interior West. In: Our Living Resources: A Report to the Nation on the Distribution, Abundance, and Health of U.S. Plants, Animals, and Ecosystems. Washington, D.C.: U.S. Geological Survey. Archived from the original(PDF) on 2007-10-31.
This article incorporates public domain material from Singer, Francis (1995). "Bighorn Sheep in the Rocky Mountain National Parks"(PDF). In Stohlgren, T.J. (ed.). The Interior West. In: Our Living Resources: A Report to the Nation on the Distribution, Abundance, and Health of U.S. Plants, Animals, and Ecosystems. Washington, D.C.: U.S. Geological Survey. Archived from the original(PDF) on 2007-10-31.