Cita APA (7a ed.)

Greenbaum, S. (1985). The English language today. Pergamon Institute of English.

Cita Chicago Style (17a ed.)

Greenbaum, Sidney. The English Language Today. Oxford [etc.]: Pergamon Institute of English, 1985.

Cita MLA (9a ed.)

Greenbaum, Sidney. The English Language Today. Pergamon Institute of English, 1985.