APA (7th ed.) Citation

Greenbaum, S. (1991). An introduction to English grammar ([1st ed.].). Longman.

Chicago Style (17th ed.) Citation

Greenbaum, Sidney. An Introduction to English Grammar. [1st ed.]. Harlow: Longman, 1991.

MLA (9th ed.) Citation

Greenbaum, Sidney. An Introduction to English Grammar. [1st ed.]. Longman, 1991.

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