Cita APA (7th ed.)

THOMSON, A. (1970). practical english grammar (2 ed.). E.L.B.S., O.U.P.

Cita Chicago (17th ed.)

THOMSON, A.J. Practical English Grammar. 2 ed. London: E.L.B.S., O.U.P, 1970.

Cita MLA (9th ed.)

THOMSON, A.J. Practical English Grammar. 2 ed. E.L.B.S., O.U.P, 1970.