Roberts, E. V. (1991). Writing themes about literature. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Roberts, Edgar V. Writing Themes About Literature. Englewood Cliffs, N.J: Prentice Hall, 1991.
Lua MLA (9ú heag.)Roberts, Edgar V. Writing Themes About Literature. Prentice Hall, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.