Texas Department of Criminal Justice. Accessed September 14, 2008. Stephens, A. Ray, and William M. Holmes, Historical Atlas of Texas. University of Oklahoma
Lydon, p. 153. ^ Evans, p. 107. ^ a b c d Charles and Ritz, p. 191. ^ a b Stephens, Robert W. (Spring 1984). "Soul: A Historical Reconstruction of Continuity
ISBN 0-275-96976-2 Stephens, William (2001), “The Rebirth of Stoicism?”, Creighton Magazine, http://puffin.creighton.edu/PHIL/Stephens/rebirth_of_stoicism