Gibson, Walter. The Shadow: A Quarter of Eight and The Freak Show Murders. New York, Doubleday Company, Inc

Gibson, Walter. The Shadow: A Quarter of Eight and The Freak Show Murders. New York, Doubleday Company, Inc, Box: 25, Folder: 7. Papers of Theodore Sturgeon, MS 254. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/244139 Accessed December 24, 2025.