New York Debut Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where." New York Times (1923-), Apr 11 1965, p. 1. ProQuest. Web. 24 Oct. 2022. Klein, Howard. "HUSBAND AND WIFE IN DUO-PIANO DEBUT." New York Times (1923-), Apr 15 1965, p. 39. ProQuest. Web. 24 Oct. 2022.
Joan Yarbrough and Robert Cowan, Duo Pianists