Gassner, J. (1964). O`nell: A collection of critical essays. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Gassner, John. O`nell: A Collection of Critical Essays. New yark: Prentice Hall, 1964.
Lua MLA (9ú heag.)Gassner, John. O`nell: A Collection of Critical Essays. Prentice Hall, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.