50 Plus; Formerly Retirement Living. New York, N.Y.: Retirement Living Publishing Co., Inc., September 1978

50 Plus; Formerly Retirement Living. New York, N.Y.: Retirement Living Publishing Co., Inc., September 1978, Volume: Gilbert D326. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525929 Accessed December 28, 2025.