APA (7th ed.) Citation

Leech, G. N. (1992). Introducing English grammar (1. publ.). Penguin English.

Chicago Style (17th ed.) Citation

Leech, Geoffrey N. Introducing English Grammar. 1. publ. London [u.a.]: Penguin English, 1992.

MLA (9th ed.) Citation

Leech, Geoffrey N. Introducing English Grammar. 1. publ. Penguin English, 1992.

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