Cita APA (7a ed.)

Widdowson, H. G. (1979). Teaching language as communication. University Press.

Cita Chicago Style (17a ed.)

Widdowson, Henry George. Teaching Language as Communication. Oxford [etc.]: University Press, 1979.

Cita MLA (9a ed.)

Widdowson, Henry George. Teaching Language as Communication. University Press, 1979.