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. Apr 20 1952. ProQuest. Web. 10 Mar. 2014. "Miss Foster Makes Vocal Bow." New York Times (1923-Current file): 19. Apr 25 1952. ProQuest. Web. 10 Mar. 2014.