New York Debut Entered from booking ledger and New York Times concert listing and review. Note that the review misspells the artist's last name as "Werner". "Opera and Concert Programs." New York Times (1923-), Dec 06 1964, p. 1. ProQuest. Web. 2 Feb. 2024. "Martha Werner in Debut." New York Times (1923-), Dec 07 1964, p. 45. ProQuest. Web. 2 Feb. 2024.