Greenbaum, S. (1991). An introduction to English grammar ([1st ed.].). Longman.
Chicago Style (17th ed.) CitationGreenbaum, Sidney. An Introduction to English Grammar. [1st ed.]. Harlow: Longman, 1991.
MLA (9th ed.) CitationGreenbaum, Sidney. An Introduction to English Grammar. [1st ed.]. Longman, 1991.