The Crisis in Mental Retardation, H.R. Turnbull at the Young Adult Institute, Conference on Handicapped People, April 10, 1981, Box: 14, Folder: 51. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/305339 Accessed June 21, 2025.