Jacqueline Moore. Booker T. Washington, W. E. B. Du Bois, and the Struggle for Racial Uplift. Lanham, MD: Rowman & Littlefield, 2003. p. 117.
124
James Boswell. The Life of Johnson. New York: Oxford University Press, 1933. Vol. I. P. 567.
125
Frederick Jackson Turner. The Significance of the Frontier in American History. Annals of America. 1968. http://www.learner.org/workshops/primarysources/corporations/docs/turner.html.
