APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Widdowson, H. G. Teaching Language as Communication / (by) H.G. Widdowson. Oxford (etc.): Oxford University Press, 1978.

MLA (9th ed.) Citation

Widdowson, H. G. Teaching Language as Communication / (by) H.G. Widdowson. Oxford University Press, 1978.

Warning: These citations may not always be 100% accurate.