APA (7th ed.) Citation

Widdowson, H. G. (1979). Explorations in applied linguistics. Oxford University Press.

Chicago Style (17th ed.) Citation

Widdowson, H. G. Explorations in Applied Linguistics. Londres: Oxford University Press, 1979.

MLA (9th ed.) Citation

Widdowson, H. G. Explorations in Applied Linguistics. Oxford University Press, 1979.