Tressler, J. C., & Christ, H. I. (1960). English in action (7th ed., Teacher's ed.). D.C. Heath.
Lua i Stíl Chicago (17ú heag.)Tressler, Jacob C., agus Henry I. Christ. English in Action. 7th ed., Teacher's ed. Boston: D.C. Heath, 1960.
Lua MLA (8ú heag.)Tressler, Jacob C., agus Henry I. Christ. English in Action. 7th ed., Teacher's ed. D.C. Heath, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.