Fostering Family-Professional Partnerships, Zuna, A. Turnbull, H.R. Turnbull in Instruction of Students with Severe Disabilities, seventh edition, 2011, Box: 2, Folder: 39. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/304925 Accessed June 24, 2025.