Fixen, Teaching-Parent Training Program, MH13644-01, Correspondence, 1974 - 1984, Box: 28, Folder: 46. 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/453073 Accessed July 19, 2025.