Hilliard, C. English as a vocation. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Hilliard, Christopher. English as a Vocation. Oxford University Press.
Lua MLA (8ú heag.)Hilliard, Christopher. English as a Vocation. Oxford University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.