APA aipamena

David Crystal. (1997). English as a global language. Cambridge, UK: Cambridge Univ. Press.

Chicago Style aipamena

David Crystal. English As a Global Language. Cambridge, UK: Cambridge Univ. Press, 1997.

MLA aipamena

David Crystal. English As a Global Language. Cambridge, UK: Cambridge Univ. Press, 1997.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.