APA (7th ed.) Citation

Crystal, D., & Quirk, R. (1985). A Comprehensive grammar of the English language. Longman.

Chicago Style (17th ed.) Citation

Crystal, David, and Randolph Quirk. A Comprehensive Grammar of the English Language. London: Longman, 1985.

MLA (9th ed.) Citation

Crystal, David, and Randolph Quirk. A Comprehensive Grammar of the English Language. Longman, 1985.

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