Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where." New York Times (1923-), 16 Jan. 1972, p. 1. ProQuest. Web. 15 Oct. 2025. Ericson, Raymond. "LIEDER OFFERED BY IRENE GUBRUD: SOPRANO SHOWS EXCEPTIONAL TASTE IN CARNEGIE RECITAL." New York Times (1923-), 22 Jan. 1972, p. 36. ProQuest. Web. 15 Oct. 2025.