Crystal, D. (2003). The Cambridge encyclopedia of the English language (2nd ed.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Crystal, David. The Cambridge Encyclopedia of the English Language. 2nd ed. Cambridge: Cambridge University Press, 2003.
Lua MLA (9ú heag.)Crystal, David. The Cambridge Encyclopedia of the English Language. 2nd ed. Cambridge University Press, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.