Cita APA (7th ed.)

Widdowson, H. (1983). learning purpose and language use. O U P.

Cita Chicago (17th ed.)

Widdowson, H. Learning Purpose and Language Use. Oxford: O U P, 1983.

Cita MLA (9th ed.)

Widdowson, H. Learning Purpose and Language Use. O U P, 1983.