Irwin, John R, Language Difficulties of Children, Appleton-Century-Crofts, 1967

Irwin, John R, Language Difficulties of Children, Appleton-Century-Crofts, 1967, Box: 11, Folder: 10. 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/175624 Accessed December 24, 2025.