Duel; The Big Adventure Book for Men. New York, N.Y.: Standard Magazines, Inc., Summer 1957

Duel; The Big Adventure Book for Men. New York, N.Y.: Standard Magazines, Inc., Summer 1957, Volume: Gilbert D282. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525801 Accessed December 27, 2025.