Niven - Neutron Star (1966), The Patchwork Girl (1977, 1980), Protector (1970), Ringworld (1968), Box: 15, Folder: 43. 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/230449 Accessed May 15, 2024.