Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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