Cita APA (7th ed.)

Quirk, R., Greenbaum, S., Leech, G. N., & Svartvik, J. (1989). A grammar of contemporary English. Longman.

Cita Chicago (17th ed.)

Quirk, Randolph, Sidney Greenbaum, Geoffrey N. Leech, i Jan Svartvik. A Grammar of Contemporary English. Essex: Longman, 1989.

Cita MLA (9th ed.)

Quirk, Randolph, et al. A Grammar of Contemporary English. Longman, 1989.