Levin, H. (1972). Grounds for comparison. Harvard Univ. Press.
Lua i Stíl Chicago (17ú heag.)Levin, Harry. Grounds for Comparison. Cambridge, Mass.: Harvard Univ. Press, 1972.
Lua MLA (8ú heag.)Levin, Harry. Grounds for Comparison. Harvard Univ. Press, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.