CRYSTAL, D. (2003). English as a global language.-- ed.2. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)CRYSTAL, David. English as a Global Language.-- Ed.2. Cambridge: Cambridge University Press, 2003.
Lua MLA (9ú heag.)CRYSTAL, David. English as a Global Language.-- Ed.2. Cambridge University Press, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.