Isaacs, N. D., & Zimbardo, R. A. (1981). Tolkien, new critical perspectives. University Press of Kentucky.
Lua i Stíl Chicago (17ú heag.)Isaacs, Neil David, agus Rose A. Zimbardo. Tolkien, New Critical Perspectives. Lexington, Ky.: University Press of Kentucky, 1981.
Lua MLA (8ú heag.)Isaacs, Neil David, agus Rose A. Zimbardo. Tolkien, New Critical Perspectives. University Press of Kentucky, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.