APA

Widdowson H. ت., .Linguistics:Oxford Introdution To Language Study. New York:Oxford University Press,2009: .

Chicago

Widdowson H.G تأليف, .Linguistics:Oxford Introdution To Language Study. New York:Oxford University Press,2009: .

Harvard

Widdowson H. ت., .Linguistics:Oxford Introdution To Language Study. New York:Oxford University Press,2009: .

MLA

Widdowson H.G تأليف, .New York:Oxford University Press,2009: . .