APA (7th ed.) Citation

Greenbaum, S. (1993). An introduction to English grammar (1. publ., 4. impr.). Longman.

Chicago Style (17th ed.) Citation

Greenbaum, Sidney. An Introduction to English Grammar. 1. publ., 4. impr. London [u.a.]: Longman, 1993.

MLA (9th ed.) Citation

Greenbaum, Sidney. An Introduction to English Grammar. 1. publ., 4. impr. Longman, 1993.

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