Washburn University, Alumni Association, 1938, 1941, 1953, 1955, 1962, 1967, Box: 3, Folder: 21. Cooper-Sheppard-Cox family papers, RH MS 576. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/159009 Accessed May 12, 2024.