APA (7th ed.) Citation

Leech, G. N., Cruickshank, B., & Ivanic, R. (1989). An A-Z of English grammar and usage. Edward Arnold.

Chicago Style (17th ed.) Citation

Leech, Geoffrey N., Benita Cruickshank, and Roz Ivanic. An A-Z of English Grammar and Usage. London: Edward Arnold, 1989.

MLA (9th ed.) Citation

Leech, Geoffrey N., et al. An A-Z of English Grammar and Usage. Edward Arnold, 1989.