Laumer - Correspondence (1961-[19]82) - Great Time Machine Hoax (1967), Retief (1966), Worlds of the Imperium (1961), Box: 12, Folder: 40. 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/230376 Accessed May 17, 2024.