Cita APA (7th ed.)

Thomson, A. (1966). A practical english grammar exercises-4 Vol 4. O.U.P.

Cita Chicago (17th ed.)

Thomson, A. A Practical English Grammar Exercises-4 Vol 4. London: O.U.P, 1966.

Cita MLA (9th ed.)

Thomson, A. A Practical English Grammar Exercises-4 Vol 4. O.U.P, 1966.