New York Debut Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where." New York Times (1923-), 21 Feb. 1971, p. 1. ProQuest. Web. 26 Aug. 2025. Sherman, Robert. "COOPER BOWS HERE WITH FRENCH HORN." New York Times (1923-), 01 Mar. 1971, p. 24. ProQuest. Web. 2 Sept. 2025.