APA (7th ed.) Citation

Leech. (1989). A communicative grammar of English. Longman.

Chicago Style (17th ed.) Citation

Leech. A Communicative Grammar of English. Harlow: Longman, 1989.

MLA (9th ed.) Citation

Leech. A Communicative Grammar of English. Longman, 1989.

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