APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Widdowson, H. Explorations in Applied Linguistics. Oxford: Oxford Uni Press, 1979.

MLA (9th ed.) Citation

Widdowson, H. Explorations in Applied Linguistics. Oxford Uni Press, 1979.