Special Education-IDEA, Positive Behavioral Supports, and School Safety, H.R. Turnbull et al. in Journal of Law and Education, Volume 30, Number 3, July 2001, Box: 2, Folder: 107. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/304993 Accessed June 20, 2025.