Gassner, J. (1965). Eugene O'Neill. University of Minnesota Press.
Lua i Stíl Chicago (17ú heag.)Gassner, John. Eugene O'Neill. Minneapolis, MN: University of Minnesota Press, 1965.
Lua MLA (9ú heag.)Gassner, John. Eugene O'Neill. University of Minnesota Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.