APA (7th ed.) Zitazioa

Crystal, D. (1997). English as a global language (1a. ed.). Cambridge University Press.

Chicago Style (17th ed.) Zitazioa

Crystal, David. English as a Global Language. 1a. ed. Cambridge: Cambridge University Press, 1997.

MLA (9th ed.) Zitazioa

Crystal, David. English as a Global Language. 1a. ed. Cambridge University Press, 1997.