APA

Widdowson H. G., . (1978). Teaching language as communication. New York: Oxford University Press.

Chicago

Widdowson H G, . 1978. Teaching language as communication. New York: Oxford University Press.

Harvard

Widdowson H. G., . (1978). Teaching language as communication. New York: Oxford University Press.

MLA

Widdowson H G, . Teaching language as communication. New York: Oxford University Press. 1978.