The Green Hornet. New York: Helnit Publishing Co., Inc., December 1940

The Green Hornet. New York: Helnit Publishing Co., Inc., December 1940, Volume: Gilbert D409. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526123 Accessed December 27, 2025.