Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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