Steiner, G. (1978). On difficulty, and other essays. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Steiner, George. On Difficulty, and Other Essays. New York: Oxford University Press, 1978.
Lua MLA (8ú heag.)Steiner, George. On Difficulty, and Other Essays. Oxford University Press, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.