"L'existentialisme et la vie philosophique aux Etats-Unis" with E. Robinson and J. Russell, Les Etudes Philosophiques, N. S. XIX, pp. 265-274, 1964, Box: 13, Folder: 10. 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/315343 Accessed June 18, 2025.