Risley, Todd, Exploratory Behavior of the Profoundly Multi-Handicapped, KU# 4136, December 22, 1983, Box: 68, Folder: 9. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/455603 Accessed May 17, 2025.