APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Widdowson, H. G. Teaching Language as Communication. Oxford: Oxford University Press, 1978.

MLA (9th ed.) Citation

Widdowson, H. G. Teaching Language as Communication. Oxford University Press, 1978.