Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS FOR THE WEEK." New York Times (1923-Current file), Apr 29 1956, p. 137. ProQuest. Web. 16 Mar. 2021. "ANITA HALGEN SINGS: SOPRANO OFFERS A PROGRAM AT CARNEGIE RECITAL HALL." New York Times (1923-Current file), Apr 30 1956, p. 19. ProQuest. Web. 16 Mar. 2021.