SPED 725: Introduction To The Psychology And Education of Exceptional Children And Youth Deck 1, Tape 2 - VHS tape, July 12, 1994, Box: 5, Case: 5. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/305095 Accessed June 18, 2025.