Language Perspectives-Acquisition, Retardation, and Intervention edited by Schiefelbusch and Lyle L. Lloyd, 1974, Box: 10, item: 5. Personal Papers of Richard Schiefelbusch, PP 458. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/266516 Accessed November 30, 2024.