Peterson, Cynthia L. (2009). "Historical Tribes and Early Forts". In William E. Whittaker (ed.). Frontier Forts of Iowa: Indians, Traders, and Soldiers, 1682–1862. Iowa City: University of Iowa Press. pp. 12–29. ISBN978-1-58729-831-8. Archived from the original on August 5, 2009. Retrieved December 11, 2009.
pubs.lib.uiowa.edu
Thomas J. Bray, "The Cummins Leadership" Annals of Iowa (1954) 32#4 pp. 241–296. online
web.archive.org
Peterson, Cynthia L. (2009). "Historical Tribes and Early Forts". In William E. Whittaker (ed.). Frontier Forts of Iowa: Indians, Traders, and Soldiers, 1682–1862. Iowa City: University of Iowa Press. pp. 12–29. ISBN978-1-58729-831-8. Archived from the original on August 5, 2009. Retrieved December 11, 2009.