Heffner, Rickye and Henry Heffner, Hearing in Reptiles, KU# 5939, July 30, 1981, Box: 42, Folder: 36. 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/454060 Accessed May 22, 2025.