APA

O'Connor J. ت., .Better English Pronunciation. New York:Cambridge University Press,2003: .

Chicago

O'Connor J.D تأليف, .Better English Pronunciation. New York:Cambridge University Press,2003: .

Harvard

O'Connor J. ت., .Better English Pronunciation. New York:Cambridge University Press,2003: .

MLA

O'Connor J.D تأليف, .New York:Cambridge University Press,2003: . .