Ross - Castle on the Hill (1964), Cauldron of Evil, Christopher's Mansion (1969), The Ghost and the Garnet (1974), Box: 17, Folder: 30. 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/230500 Accessed May 15, 2024.