(1996). Headway advanced ( workbook ). Oxford: Oxford Univ.Press.
Trích dẫn kiểu ChicagoHeadway Advanced ( Workbook ). Oxford: Oxford Univ.Press, 1996.
Deismireacht MLAHeadway Advanced ( Workbook ). Oxford: Oxford Univ.Press, 1996.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.