APA (7th ed.) Citation
Greenbaum, S., & Whitcut, J. (1989). Longman guide to English usage (3.Edition.). Longman Group UK.
Chicago Style (17th ed.) Citation
Greenbaum, Sidney, and Janet Whitcut. Longman Guide to English Usage. 3.Edition. Harlow: Longman Group UK, 1989.
MLA (9th ed.) Citation
Greenbaum, Sidney, and Janet Whitcut. Longman Guide to English Usage. 3.Edition. Longman Group UK, 1989.
Warning: These citations may not always be 100% accurate.