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Frank, Ross. 2005. Plains Indian Ledger Art. Electronic document,

Neihardt, John G. 1961. Black Elk Speaks: Being the Life Story of a Holy Man of the Oglala Sioux. Lincoln, Nebraska: University of Nebraska Press.

Ostler, Jeffrey. 2004. The Plains Sioux and U.S. Colonialism from Lewis and Clark to Wounded Knee. New York: Cambridge University Press.