Niven - All the Myriad Ways (1970), Not Long Before the End (1970), Assimilating Our Cultures (1978), Convergent Series (1978), The Flight of the Horse (1971), Box: 15, Folder: 39. 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/230445 Accessed May 15, 2024.