Biomedical Sciences, 4795-5706-3, Kenneth Ruder, A Preliminary Examination of the Text of Communicative Abilities, May 1-November 30, 1978, Box: 4, Folder: 14. 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/452344 Accessed May 13, 2025.