Cita APA (7th ed.)

Thomas, A. (1970). A practical English grammer (2nd.). O U P.

Cita Chicago (17th ed.)

Thomas, A. A Practical English Grammer. 2nd. London: O U P, 1970.

Cita MLA (9th ed.)

Thomas, A. A Practical English Grammer. 2nd. O U P, 1970.