Tressler, J. C., & Christ, H. I. (1962). Grammar in action (4th ed.). Heath.
Lua i Stíl Chicago (17ú heag.)Tressler, Jacob C., agus Henry I. Christ. Grammar in Action. 4th ed. Boston: Heath, 1962.
Lua MLA (8ú heag.)Tressler, Jacob C., agus Henry I. Christ. Grammar in Action. 4th ed. Heath, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.