James K. Polk (2009). “Messages and Papers of the Presidents: James K. Polk, Zachary Taylor, Millard Fillmore, and Franklin Pierce”, p.2479, Wildside Press LLC
George Catlin (1857). “Illustrations of the Manners, Customs, and Condition of the North American Indians: With Letters and Notes Written During Eight Years of Travel and Adventure Among the Wildest and Most Remarkable Tribes Now Existing ; with 360 Engravings, from the Author's Original Paintings”, p.16