found: Gershwin, G. Oh, Kay! [SR] p1973: label (Jack Cassidy)
found: Halliwell, L. Halliwell's Filmgoer's companion, 8th ed. (Cassidy, Jack, 1926-1976)
found: Internet movie database, Aug. 15, 2012 (Jack Cassidy; b. John Joseph Edward Cassidy, Mar. 5, 1927, Richmond Hill, N.Y.; d. Dec. 12, 1976, West Hollywood, Los Angeles; actor)
found: Gale biography in context WWW site, Aug. 15, 2012 (Jack Cassidy; b. John Edward Joseph Cassidy, Mar. 5, 1927, Richmond Hill, Queens, New York City; d. Dec. 12, 1976, West Hollywood, Calif.; stage, television, and film actor)
found: SSDI, Aug. 15, 2012 (John Cassidy; b. Mar. 5, 1927; d. Dec. 1976; last benefit: Los Angeles)