Andrews, Thomas G. “The Road to Ludlow: Work, Environment, and Industrialization,1870-1915.” Ph.D. Dissertation, Department of History, University of Wisconsin, Madison, 2003.
Clutton-Brock, Juliet. A Natural History of Domesticated Mammals. Austin: University of Texas Press, 1987.
Colorado Humane Society and the State Bureau of Child and Animal Protection. Child and Animal Protection. (Periodical, Denver): 1910.
Daly, H.W. Manual of Pack Transportation. Washington, D.C.: Government Printing Office, 1917.
Essin, Emmet M. Shavetails & Bell Sharps: The History of the U.S. Army Mule. Lincoln: University of Nebraska Press, 1997.
Jackson, Louise A. The Mule Men: A History of Stock Packing in the Sierra Nevada. Missoula: Mountain Press Publishing Company, 2004.
Jefferson, Henry Bridges. “My Colorado Experience: The Brief Career of a Muleskinner.” Colorado Heritage (Summer 2003): 41-47.
Keefover-Ring, Wendy. “Municipal Housekeeping, Domestic Science, Animal Protection and Conservation: Women’s Political and Environmental Activism in Denver, Colorado, 1894-1912.” M.A. Thesis, Department of History, University of Colorado, 2002.
Lamar, Howard R. editor. The New Encyclopedia of the American West. New Haven: Yale University Press, 1998.
Walker, Henry Pickering. The Wagon Masters: High Plains Freighting from the Earliest Days of the Santa Fe Trail to 1880. Norman: University of Oklahoma Press, 1966.
West, Elliott. The Way West. Albuquerque: University of New Mexico Press, 1995.
Whiteside, James. Regulating Danger: The Struggle for Mine Safety in the Rocky Mountain Coal Industry. Lincoln: University of Nebraska Press, 1990.
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