North American Indians: Indians of the Plains
From Jones, Lindsay (Editor). Encyclopedia of Religion, 15 Volume Set, 2E. © 2005 Gale, a part of Cengage Learning, Inc. Reproduced by permission. http://www.cengage.com/permissions.
William K. Powers and Kathleen J. Martin. "North American Indians: Indians of the Plains" Encyclopedia of Religion, Second Edition (2005).
Available at: http://works.bepress.com/kamartin/2