1938 Cooley R.A. & G.M. Kohls Ixodes marmotae. A new species of tick from marmots (Acarina : Ixodidae) [Ixodes marmotae. Une nouvelle espèce de tique chez les marmottes]. Publ. Health Rep., 58 : 2174-2181
2000 Cooper A. Marmota olympus (On-line), Animal Diversity Web. Accessed March 28, 2006
1868 Cooper J.G. The fauna of Montana Territory [La faune du territoire du Montana]. Amer. Nat., 2: 528-538, 596-600, 3: 73-84, 294-299, 405-422
1869 Cooper J.G. Notes on the fauna of the upper Missouri [Notes sur la faune du haut Missouri]. Amer. Nat., 3:294-299.
1854 Cooper J.G. & Suckley G. The natural history of Washington Territory, with much relating to Minnesota, Nebraska, Kansas, Oregon, and California, between the thirty-sixth and forty-ninth parallels of latitude, being those parts of the final reports on the survey of the northern Pacific railroad route, containing the climate and physical geography, with full catalogues and descriptions of the plants and animals collected from 1853-1857. Bailliere Bros., New York.