Cita APA

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

Citación estilo Chicago

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

Cita MLA

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