Heffner, Henry, Behavioral Analysis of the role of the Auditory Cortex, September, 1983, Box: 42, Folder: 4. 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/454028 Accessed July 20, 2025.