Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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