Private Investigator Detective Magazine. New York: Republic Features Syndicate, Inc., Winter 1956

Private Investigator Detective Magazine. New York: Republic Features Syndicate, Inc., Winter 1956, Volume: Gilbert D817. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527142 Accessed December 27, 2025.