Entered from booking ledger and New York Times concert listing and review. "THIS WEEK'S CONCERT AND OPERA PROGRAMS." New York Times (1923-), Jan 12 1964, p. 1. ProQuest. Web. 1 Nov. 2023. Strongin, Theodore. "PHILHARMONIA TRIO JOINED BY A FOURTH." New York Times (1923-), Jan 15 1964, p. 28. ProQuest. Web. 1 Nov. 2023.