APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Widdowson, H. G. Aspects of Language Teaching. Oxford [u.a.]: Oxford Univ. Press, 1990.

MLA (9th ed.) Citation

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

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