Risley/Jones, Exploratory Behavior of the Profoundly Multi-Handicapped, KU# 4136, 1 RO1 HD 16354-01A1, Correspondence File, 1982 - 1986, Box: 68, Folder: 7. 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/455601 Accessed June 02, 2024.