New York Debut Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS OF THE WEEK." New York Times (1923-), Feb 28 1960, p. 1. ProQuest. Web. 9 June 2022. "ENGEL IN DEBUT HERE: PHILADELPHIA PIANIST PLAYS AT CARNEGIE RECITAL HALL." New York Times (1923-), Mar 06 1960, p. 82. ProQuest. Web. 15 June 2022.