Risley, Todd, Exploratory Behavior of the Profoundly Multi-Handicapped, 4136-1, 1 RO1 HD 16354-01A1, December 1, 1982-November 30, 1983, Box: 68, Folder: 6. 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/455600 Accessed July 09, 2025.