Digest Year Book. New York City, N.Y.: The World Digest Association, Inc., 1937

Digest Year Book. New York City, N.Y.: The World Digest Association, Inc., 1937, Volume: Gilbert B68. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525763 Accessed December 26, 2025.