Levin, M. (1968). Noel Coward. Twayne Publishers.
Lua i Stíl Chicago (17ú heag.)Levin, Milton. Noel Coward. New York: Twayne Publishers, 1968.
Lua MLA (8ú heag.)Levin, Milton. Noel Coward. Twayne Publishers, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.