Cita APA (7a ed.)
Widdowson, H. G. Teaching Language as Communication. Oxford University.
Cita estilo Chicago (17a ed.)
Widdowson, Henry G. Teaching Language as Communication. Inglaterra: Oxford University.
Cita MLA (9a ed.)
Widdowson, Henry G. Teaching Language as Communication. Oxford University.
Precaución: Estas citas no son 100% exactas.