Oxenden, C., & Koenig, C. L. (1999). English file: Intermediate student's book. Oxford: Oxford Univ. Press.
Trích dẫn kiểu ChicagoOxenden, Clive, và Christina Latham Koenig. English File: Intermediate Student's Book. Oxford: Oxford Univ. Press, 1999.
Deismireacht MLAOxenden, Clive, và Christina Latham Koenig. English File: Intermediate Student's Book. Oxford: Oxford Univ. Press, 1999.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.