Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where." New York Times (1923-), 29 Nov. 1970, p. 136. ProQuest. Web. 21 Aug. 2025. "Ruben Varga Plays Own Violin Sonata." New York Times (1923-), 07 Dec. 1970, p. 62. ProQuest. Web. 21 Aug. 2025.