New York Debut Entered from booking ledger and New York Times concert listing and review. "THE WEEK'S MUSIC PROGRAMS." New York Times (1923-), Sep 27 1964, p. 1. ProQuest. Web. 4 Jan. 2024. Strongin, Theodore. "Ok Soo Han of Korea Makes Piano Debut here." New York Times (1923-), Sep 30 1964, p. 37. ProQuest. Web. 8 Jan. 2024.