Christ, H. I. (1982). Modern english in action. D.C. Heath and Comp.
Lua i Stíl Chicago (17ú heag.)Christ, Henry I. Modern English in Action. D.C. Heath and Comp, 1982.
Lua MLA (8ú heag.)Christ, Henry I. Modern English in Action. D.C. Heath and Comp, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.