Cita APA (7a ed.)

Widdowson, H. G. (1991). Aspects of language teaching. University Press.

Cita Chicago Style (17a ed.)

Widdowson, Henry George. Aspects of Language Teaching. Oxford [etc.]: University Press, 1991.

Cita MLA (9a ed.)

Widdowson, Henry George. Aspects of Language Teaching. University Press, 1991.