Cita APA (7th ed.)

Thomson, A. (1970). A practical English grammer Economics 1 to 6. O U P.

Cita Chicago (17th ed.)

Thomson, A. A Practical English Grammer Economics 1 to 6. London: O U P, 1970.

Cita MLA (9th ed.)

Thomson, A. A Practical English Grammer Economics 1 to 6. O U P, 1970.