Harrison - Best SF [Science Fiction] (1973, 1974, 1975), Bill, the Galactic Hero (1964, 1974), Box: 9, Folder: 31. 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/230248 Accessed May 16, 2024.