Steelman - Portrait of a Sioux (1975, 1977, 1978), Surgeon to the Sioux (1978), White Medicine Man (1978), Box: 21, Folder: 28. Corporate Papers of the Robert Mills Literary Agency, MS 307. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/230675 Accessed May 15, 2024.