APA (7th ed.) Citation

Leech, G. N., & Svartvik, J. (1973). A communicative grammar of English. Longman.

Chicago Style (17th ed.) Citation

Leech, Geoffrey N., and Jan Svartvik. A Communicative Grammar of English. Harlow, England: Longman, 1973.

MLA (9th ed.) Citation

Leech, Geoffrey N., and Jan Svartvik. A Communicative Grammar of English. Longman, 1973.