Dr. Frank Beach - "Experimental study of behavior " (March 1956); Dr. Gordon Murphy - "Impact of Freud on current psychology" (October, 1956), Box: 6, tape: 10. Personal papers of M. Erik Wright, PP 403. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/566 Accessed February 13, 2025.