"The Marxists", Reading Philosophy for the XXIst Century, ed. by George F. MacLean, New York: University Press of America, pp. 289-313, 1989

"The Marxists", Reading Philosophy for the XXIst Century, ed. by George F. MacLean, New York: University Press of America, pp. 289-313, 1989, Box: 14, Folder: 24. Personal papers of Richard T. De George, PP 531. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/315430 Accessed March 03, 2026.