Cita APA (7th ed.)

Widdowson, H. G. (1990). Aspects of language teaching (1a. ed.). Oxford University Press.

Cita Chicago (17th ed.)

Widdowson, H. G. Aspects of Language Teaching. 1a. ed. Oxford: Oxford University Press, 1990.

Cita MLA (9th ed.)

Widdowson, H. G. Aspects of Language Teaching. 1a. ed. Oxford University Press, 1990.