Burchfield, R. W., & Simpson,John. (2003). The English language. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Burchfield, Robert W., agus Simpson,John. The English Language. Oxford: Oxford University Press, 2003.
Lua MLA (9ú heag.)Burchfield, Robert W., agus Simpson,John. The English Language. Oxford University Press, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.