Program Project, Communication Research with Retarded Children, Joseph Spradlin, 4354-13, HD-00870-13, Renewal Application, August 29, 1974, Box: 60, Folder: 7. 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/455377 Accessed May 18, 2025.