Culley, R. C. (1992). Themes and Variations. Scholars press.
Lua i Stíl Chicago (17ú heag.)Culley, Robert C. Themes and Variations. Gorgia: Scholars press, 1992.
Lua MLA (9ú heag.)Culley, Robert C. Themes and Variations. Scholars press, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.