APA (7th ed.) Citation

Quirk, R., & Crystal, D. (1994). A comprehensive grammar of the English language (1st published, 12th. imp.). Longman.

Chicago Style (17th ed.) Citation

Quirk, Randolph, and David Crystal. A Comprehensive Grammar of the English Language. 1st published, 12th. imp. London [etc.]: Longman, 1994.

MLA (9th ed.) Citation

Quirk, Randolph, and David Crystal. A Comprehensive Grammar of the English Language. 1st published, 12th. imp. Longman, 1994.