Cita APA (7th ed.)

CRYSTAL, D. (2003). English as a global language.-- ed.2. Cambridge University Press.

Cita Chicago (17th ed.)

CRYSTAL, David. English as a Global Language.-- Ed.2. Cambridge: Cambridge University Press, 2003.

Cita MLA (9th ed.)

CRYSTAL, David. English as a Global Language.-- Ed.2. Cambridge University Press, 2003.