APA

Widdowson H. G., . (1979). Explorations in applied linguistics. Oxford: Oxford university press.

Chicago

Widdowson H G, . 1979. Explorations in applied linguistics. Oxford: Oxford university press.

Harvard

Widdowson H. G., . (1979). Explorations in applied linguistics. Oxford: Oxford university press.

MLA

Widdowson H G, . Explorations in applied linguistics. Oxford: Oxford university press. 1979.