APA Edition Citation

Greenbaum, S., Leech, G., & Quirk, R. (1972). A grammar of contemporary english.

Chicago Edition Citation

Greenbaum, Sidney, Geoffrey Leech, and Randolph Quirk. A Grammar of Contemporary English. London, Longman, 1972.

MLA Edition Citation

Greenbaum, Sidney, et al. A Grammar of Contemporary English. 1972.