Entered from program calendar and New York Times concert listing and review. "Concert and Opera Programs of the Week." New York Times (1923-Current file): 1. Mar 01 1953. ProQuest. Web. 20 Aug. 2014. "Maria Sobol Is Heard." New York Times (1923-Current file): 20. Mar 02 1953. ProQuest. Web. 20 Aug. 2014.