Cita APA (7th ed.)

Quirk, R. (1972). A Grammar of contemporary English. Seminar Press.

Cita Chicago (17th ed.)

Quirk, Randolph. A Grammar of Contemporary English. New York: Seminar Press, 1972.

Cita MLA (9th ed.)

Quirk, Randolph. A Grammar of Contemporary English. Seminar Press, 1972.