Symposium Response: Defensible Analyses of P.L. 94-142: A Response, A. Turnbull, Leonard, and H.R. Turnbull, Box: 14, Folder: 40. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/305328 Accessed June 15, 2025.