Gershon, S. (2002). English upgrade: Student CD. Oxford, UK: Macmillan.
Trích dẫn kiểu ChicagoGershon, Steven. English Upgrade: Student CD. Oxford, UK: Macmillan, 2002.
Deismireacht MLAGershon, Steven. English Upgrade: Student CD. Oxford, UK: Macmillan, 2002.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.