(1993). Headway Upper-immediate: (Student's book). Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoHeadway Upper-immediate: (Student's Book). Oxford: Oxford University Press, 1993.
Deismireacht MLAHeadway Upper-immediate: (Student's Book). Oxford: Oxford University Press, 1993.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.