. . . "New York Recital Debut\r\nEntered from booking ledger and New York Times concert listing and review. The accompanist is not identified, and the complete program and correct order are uncertain.\r\n\"Who Makes Music and Where.\" New York Times (1923-), 04 May 1969, p. 1. ProQuest. Web. 20 May 2025.\r\nSherman, Robert. \"Donald Mathis, Tenor, in Debut at Recital Hall.\" New York Times (1923-), 05 May 1969, p. 57. ProQuest. Web. 20 May 2025." . . . . . . . . . . "Donald Mathis, Tenor" . . "solo recital" . "1969-05-04T17:45:00"^^ .