APA (7th ed.) Citation

Greenbaum, S. (1994). An introduction to English grammar (5. impr.). Longman.

Chicago Style (17th ed.) Citation

Greenbaum, Sidney. An Introduction to English Grammar. 5. impr. Harlow: Longman, 1994.

MLA (9th ed.) Citation

Greenbaum, Sidney. An Introduction to English Grammar. 5. impr. Longman, 1994.

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