Lingwall, James B., Professional Training in Language Intervention with Developmentally Disabled Children, 2405/6014-4, 55P-35705/7-04, August 1, 1974-July 31, 1975, Box: 49, Folder: 36. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/454302 Accessed May 20, 2025.