Heffner, Rickye, Comparative Study of Sound Localization in Mammals, KU# 4916-4, May 17, 1985, Box: 42, 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/454053 Accessed July 20, 2025.