Program Project, Communication Research with Retarded Children, Joseph Spradlin, 4354-11, HD-00870-11, October 1, 1973-September 30, 1974, Box: 60, Folder: 5. 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/455375 Accessed July 18, 2025.