Entered from booking ledger and New York Times concert listing and review. The listing for the Mozart sonata appears only as "Sonata (K. 402)"; it is unclear if this was intended to refer to the Sonata in C Major, K. 403, or perhaps the Sonata in E-flat Major, K. 302. WORLD PREMIERE of Sherwood Shaffer's SONATA FOR VIOLIN AND PIANO "This Week's Music." New York Times (1923-), Jun 05 1966, p. 138. ProQuest. Web. 10 Sep. 2024. "Violin Work Gets Premiere in Recital by Elsa Brandt." New York Times (1923-), Jun 06 1966, p. 50. ProQuest. Web. 10 Sep. 2024.