Davis, R. (1919). Practical exercises in English. Ginn.
Lua i Stíl Chicago (17ú heag.)Davis, Roy. Practical Exercises in English. Boston: Ginn, 1919.
Lua MLA (8ú heag.)Davis, Roy. Practical Exercises in English. Ginn, 1919.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.