Strabo, Book II, chap. V. 26.
McGee and Thomas, Prehistoric North America, p. 3, map. Philadelphia, 1905.
D.G. Brinton, Races and Peoples, pp. 248-249. Philadelphia, 1901.
D.G. Brinton, The American Race, pp. 58, 103-104. Philadelphia, 1901. McGee and Thomas, Prehistoric North America, p. 86. Philadeladelphia, 1905 Ratzel, History of Mankind, Vol. I, pp. 5-7, 145-147, 153.
Ibid., p. 293. E.J. Payne, History of the New World Called America, Vol. II, p. 315. Oxford, 1899.
Ibid., Vol. II, pp. 412-417. McGee and Thomas, Prehistoric North America, pp. 72-75. Philadelphia, 1905.
W.H. Dall, Masks, Labrets, and Certain Aboriginal Customs, Third Annual Report of Bureau of Ethnology, pp. 146-147. Washington, 1884.
Cyrus Thomas, Report of Mound Explorations, pp. 522-523, 722-728. Twelfth Annual Report of the Bureau of Ethnology, Washington, 1894.
E.J. Payne, History of the New World Called America, Vol. II, pp. 382-383. Oxford, 1899.
N.S. Shaler, Nature and Man in America, pp. 151, 168-173. New York, 1891.