APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.