Heffner, Henry, Behavioral Analysis of the role of the Auditory Cortex, January 1, 1978, Box: 41, Folder: 29. 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/454022 Accessed March 12, 2025.