APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Greenbaum, Sidney. The English Language Today. Oxford [Oxfordshire] ; New York: Pergamon Institute of English, 1985.

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.