Hoyt, Jr., Robert, Film Contract between Bureau of Child Research and Four State Councils for the Developmentally Disabled, undated, Box: 44, Folder: 24. 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/454111 Accessed June 26, 2024.