APA

تأليف Comfort, .Oxford Business English Skills :Effective. New York:Oxford University Press, 2003: .

Chicago

تأليف Comfort, .Oxford Business English Skills :Effective. New York:Oxford University Press, 2003: .

Harvard

تأليف Comfort, .Oxford Business English Skills :Effective. New York:Oxford University Press, 2003: .

MLA

تأليف Comfort, .New York:Oxford University Press, 2003: . .