Frederik Pohl - The Expert Dreamers (1961), Man Plus (1972), Jem (1976), The Invisible Men (1976), Box: 16, Folder: 44. 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/229809 Accessed May 07, 2024.