Public Policy Foundations for Positive Behavioral Interventions, Strategies, and Supports, H.R. Turnbull et al. in Journal of Positive Behavior Interventions, Volume 2, Number 4, Fall 2000, Box: 2, Folder: 106. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/304992 Accessed June 21, 2025.