Crystal, D. (1995). The Cambridge encyclopedia of the English language. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Crystal, David. The Cambridge Encyclopedia of the English Language. Cambridge [England] ; New York: Cambridge University Press, 1995.
Lua MLA (8ú heag.)Crystal, David. The Cambridge Encyclopedia of the English Language. Cambridge University Press, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.