Heffner, Rickye, Comparative Study of Sound Localization in Mammals, KU# 4916, NS17850, June 25, 1986, Box: 42, Folder: 31. 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/454055 Accessed July 18, 2025.