APA (7th ed.) Citation

Greenbaum, S. (1988). Guide to English usage. Longman Group UK.

Chicago Style (17th ed.) Citation

Greenbaum, Sidney. Guide to English Usage. Essex, England: Longman Group UK, 1988.

MLA (9th ed.) Citation

Greenbaum, Sidney. Guide to English Usage. Longman Group UK, 1988.

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