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-), May 04 1958, p. 1. ProQuest. Web. 16 Nov. 2021. Schonberg, Harold C. "ESPINA SINGS IN DEBUT: PHILIPPINE BARITONE IS HEARD AT CARNEGIE RECITAL HALL." New York Times (1923-), May 09 1958, p. 19. ProQuest. Web. 17 Nov. 2021.