New York Debut Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where." New York Times (1923-), 08 Mar. 1970, p. 1. ProQuest. Web. 23 July 2025. Strongin, Theodore. "ZEST MARKS DEBUT OF PRO ARTE GROUP." New York Times (1923-), 09 Mar. 1970, p. 45. ProQuest. Web. 23 July 2025.