Cita APA (7a ed.)

Widdowson, H. (1996). Linguistics (1st. ed.). Oxford University.

Cita Chicago Style (17a ed.)

Widdowson, H.G. Linguistics. 1st. ed. Oxford: Oxford University, 1996.

Cita MLA (8a ed.)

Widdowson, H.G. Linguistics. 1st. ed. Oxford University, 1996.