Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS FOR THE WEEK." New York Times (1923-Current file), May 05 1957, p. 138. ProQuest. Web. 9 Aug. 2021."SUZANNNE STEN SINGS RECITAL OF LIEDER." New York Times (1923-Current file), May 10 1957, p. 20. ProQuest. Web. 9 Aug. 2021.