Harrison - SF [Science Fiction]: Author's Choice #4 (1971), Science Fiction Novellas (1973), Reader (1967), Skyfall (1976), Box: 9, Folder: 25. 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/230242 Accessed May 16, 2024.