Program Project, Communication Research with Retarded Children, Joseph Spradlin, 4354-9, HD-00870-09, October 1, 1971-September 30, 1972, Box: 60, Folder: 1. 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/455371 Accessed June 02, 2024.