APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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