Heffner, Rickye, Comparative Study of Sound Localization in Mammals, KU# 4916-x706-1, NS17850-01 (as funded), October 26, 1981, Box: 42, Folder: 21. 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/454045 Accessed July 15, 2025.