Lingwall, James B., Professional Training in Language Intervention with Developmentally Disabled Children, 2405/6014-1, 55P-35705/7-01, August 1, 1971-July 31, 1972, Box: 49, Folder: 33. 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/454299 Accessed May 14, 2025.