CHRIST, H. I., & CARLIN, J. (1982). Modern English in action. D.C. Heath and Co.
Lua i Stíl Chicago (17ú heag.)CHRIST, Henry I., agus Jerome CARLIN. Modern English in Action. Lexington: D.C. Heath and Co, 1982.
Lua MLA (9ú heag.)CHRIST, Henry I., agus Jerome CARLIN. Modern English in Action. D.C. Heath and Co, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.