Wellek, R., & Nichols, S. G. (1965). Concepts of criticism: René Wellek. Ed. and with an introduction by Stephen G. Nichols (3. print.). Yale Univ. Press.
Lua i Stíl Chicago (17ú heag.)Wellek, René, agus Stephen G. Nichols. Concepts of Criticism: René Wellek. Ed. and with an Introduction by Stephen G. Nichols. 3. print. New Haven ; London: Yale Univ. Press, 1965.
Lua MLA (8ú heag.)Wellek, René, agus Stephen G. Nichols. Concepts of Criticism: René Wellek. Ed. and with an Introduction by Stephen G. Nichols. 3. print. Yale Univ. Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.