Finch, D. M. (1992). Threatened, endangered, and vulnerable species of terrestrial vertebrates in the rocky mountain region. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station.
Cita Chicago (17th ed.)Finch, Deboran M. Threatened, Endangered, and Vulnerable Species of Terrestrial Vertebrates in the Rocky Mountain Region. Fort Collins, Colorado: United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1992.
Cita MLA (9th ed.)Finch, Deboran M. Threatened, Endangered, and Vulnerable Species of Terrestrial Vertebrates in the Rocky Mountain Region. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1992.