The Master Key Magazine; The application of "The Master Key" ideas to the affairs of everyday life. London, England: The Master Key Publishing Co., November 1935

The Master Key Magazine; The application of "The Master Key" ideas to the affairs of everyday life. London, England: The Master Key Publishing Co., November 1935, Volume: Gilbert C304. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526644 Accessed March 23, 2026.