H. Craig Miner and William E. Unrau, The End of Indian Kansas: A Study of Cultural Revolution, 1854-1871 (Lawrence: Regents Press of Kansas, 1978), 47-48.
Paul Wallace Gates, Fifty Million Acres: Conflicts over Kansas Land Policy, 1854-90 (Ithaca: Cornell Univ. Press, 1954), 137-39.
There is a picture of Boudinot in In Memoria: Elias Cornelius Boudinot (Chicago: Rand McNally, c. 1890), frontispiece. The best biography of him is James W. Parins. Parins has done by far the most research and tries, in a limited fashion, to rehabilitate Boudinot by contextualizing him.
James W. Parins, Elias Cornelius Boudinot: A Life on the Cherokee Border (Lincoln: Univ. of Nebraska Press, 2006), for contextualization see 1-2.
Dewey Whitsett Hodges, Colonel E. C. Boudinot and His Influence on Oklahoma History (M.A. thesis, Univ. of Oklahoma, 1929), 5-8, 18.
Boudinot outlined his position in Speech of Elias Boudinot of the Cherokee Nation, Delivered at Vinita, Indian Territory, August 29, 1874 (St. Louis: Barns & Beynon, 1874).
Elias C. Boudinot, The Memorial of Elias C. Boudinot to the Congress of the United States (Washington, D.C., 1877).
H. Craig Miner, The Corporation and the Indian: Tribal Sovereignty and Industrial Civilization in Indian Territory in Indian Territory, 1865-1907 (Columbia: Univ. of Missouri Press, 1976), 20-29, 42.