1. S. C. Gwyne, Empire of the Summer Moon: Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History (New York: Scribner, 2010), pp. 36–41.
2. Kelly F. Himmel, The Conquest of the Karankawas and the Tonkawas, 1821–1859 (College Station: Texas A & M Press, 1999), p. 84.
3. Ibid., pp. 85–86; Dee Brown, Bury My Heart at Wounded Knee: An Indian History of the American West (New York: Henry Holt, 1970), pp. 269–270.
4. Russell Thornton, American Indian Holocaust and Survival: A Population History since 1492 (Norman: University of Oklahoma Press, 1987), p. 43.
5. Alexis de Tocqueville, “Letters from America,” trans. Frederick Brown, Hudson Review, Vol. 62, No. 3 (Autumn 2009), pp. 390–391.