"Duties and Ideals in Leonard Nelson's Ethics", Kant-Studien, II (1959 - 1960), pp. 259-271, 1960

"Duties and Ideals in Leonard Nelson's Ethics", Kant-Studien, II (1959 - 1960), pp. 259-271, 1960, Box: 13, Folder: 1. 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/315334 Accessed December 24, 2025.