David Crystal. (1997). English as a global language. Cambridge, UK: Cambridge Univ. Press.
Trích dẫn kiểu ChicagoDavid Crystal. English As a Global Language. Cambridge, UK: Cambridge Univ. Press, 1997.
Deismireacht MLADavid Crystal. English As a Global Language. Cambridge, UK: Cambridge Univ. Press, 1997.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.