Lingwall, James B., Professional Training in Language Intervention with Developmentally Disabled Children, Submitted, May 3, 1972, Box: 49, Folder: 34. 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/454300 Accessed July 13, 2025.