Testimonial to the Martyrs of Communist Tyranny Entered from the booking ledger and New York Times concert listing and review. "WEEK'S MUSIC PROGRAMS." New York Times (1923-), Jun 14 1959, p. 1. ProQuest. Web. 7 Mar. 2022. "Ensemble Choral Unit Sings." New York Times (1923-), Jun 15 1959, p. 30. ProQuest. Web. 7 Mar. 2022.