Cita APA (7a ed.)

Widdowson, H. (1991). Aspects of language teaching ([1st., ed. 2nd. impr.].). Oxford University Press.

Cita Chicago Style (17a ed.)

Widdowson, H.G. Aspects of Language Teaching. [1st., ed. 2nd. impr.]. Toronto: Oxford University Press, 1991.

Cita MLA (9a ed.)

Widdowson, H.G. Aspects of Language Teaching. [1st., ed. 2nd. impr.]. Oxford University Press, 1991.