Ghi chú Lãnh_thổ_Dakota

  1. ↑ The New Encyclopedia of the American West. Ed. Howard R. Lamar. 1998 Yale University Press, New Haven. pp. 282
  2. ↑ Encyclopedia of the American West. Ed. Charles Philips and Alan Axelrod. 1996 Macmillan Reference USA, New York. pp.1200–1201
  3. ↑ John H. Hudson, "Migration to an American Frontier," Annals of the Association of American Geographers,(June 1976), 243–244
  4. ↑ The New Encyclopedia of the American West, 282