Bova - Fourth State of Matter (1974), Flight of Exiles (1971, 1976), Exiled from Earth (1972), Box: 2, Folder: 67. 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/230034 Accessed May 18, 2024.