APA

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

Chicago

Widdowson H G, . 1979. Explorations in applied linguistics. New York: Oxford University Press.

Harvard

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

MLA

Widdowson H G, . Explorations in applied linguistics. New York: Oxford University Press. 1979.