Keller 1-269, Schaefer 1-348 [side 1: interview with Ralph Keller; side 2: interview with Bob Schaefer], Case: 4. Kansas Society of Architects records, RH MS 850. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/398915 Accessed May 16, 2024.