The Crisis in Mental Retardation, H.R. Turnbull in From the 60s into the 80s: An International Assessments of Attitudes and Services for the Developmentally Disabled, 1982, Box: 1, Folder: 96. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/304849 Accessed June 22, 2025.