Foster, Ray, Adaptive Physical Education for Mentally Retarded /Students, February 1-July 1, 1979, Box: 28, Folder: 51. 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/453078 Accessed July 10, 2025.