Davis, E. (1960). Reading for opinion (2nd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Davis, Earle. Reading for Opinion. 2nd ed. Englewood Cliffs, New Jersey: Prentice-Hall, 1960.
Lua MLA (9ú heag.)Davis, Earle. Reading for Opinion. 2nd ed. Prentice-Hall, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.