All-Beethoven Program Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where." New York Times (1923-), 26 Apr. 1970, p. 1. ProQuest. Web. 30 July 2025. Henahan, Donal. "SALZBURG QUARTET ESSAYS BEETHOVEN." New York Times (1923-), 29 Apr. 1970, p. 50. ProQuest. Web. 30 July 2025.