Cita APA (7a ed.)

Quirk, R., Greenbaum, S., & Leech, G. (1973). A grammar of contemporary english. Longman.

Cita Chicago Style (17a ed.)

Quirk, Randolph, Sidney Greenbaum, y Geoffrey Leech. A Grammar of Contemporary English. London: Longman, 1973.

Cita MLA (8a ed.)

Quirk, Randolph, et al. A Grammar of Contemporary English. Longman, 1973.