Bova - Exiled from Earth (1970), Executive Privilege (1974), Escape (1969), End of Exile (1973), Box: 2, Folder: 66. 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/230033 Accessed May 18, 2024.