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), Oct 30 1955, p. 1. ProQuest. Web. 24 Sep. 2020. Briggs, John. "Miss Portnoy, Soprano, Gives Program." New York Times (1923-Current file), Oct 31 1955, p. 31. ProQuest. Web. 24 Sep. 2020.