Heffner, Rickye, Comparative Study of Sound Localization in Mammals, KU# 4916-4, NS17850-04, September 23, 1985-August 31, 1986, Box: 42, Folder: 30. 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/454054 Accessed May 24, 2025.