Heffner, Rickye, Comparative Study of Sound Localization in Mammals, KU# 4916-0706-2, NS17850-02, November 17, 1983, Box: 42, Folder: 26. 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/454050 Accessed July 08, 2025.