Knight - Charles Fort (1967), A Century of Science Fiction (1961, 1962, 1965, 1971), Happy Endings (1973), Box: 11, Folder: 33. 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/230317 Accessed November 23, 2024.