"Commentary on 'The Human Future from Scientific Findings'", Philosophy and the Future of Man: Proceedings of the American Catholic Philosophical Association, XLII, pp. 42-44, 1968, Box: 13, Folder: 17. 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/315350 Accessed June 23, 2025.