Entered from booking ledger and in New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS OF THE WEEK." New York Times (1923-Current file), Nov 16 1958, p. 1. ProQuest. Web. 8 June 2020. Schonberg, Harold C. "RECITAL OFFERED BY MISS RUVINSKA: PIANIST RETURNS TO STAGE HERE -- JOINED BY ADLER IN HINDEMITH SONATA." New York Times (1923-Current file), Nov 23 1958, p. 87. ProQuest. Web. 8 June 2020.