Doff, A., & Jones, C. (1997). Language in use: Upper-intermediate : self-study workbook. Cambridge: Cambridge U. P..
Trích dẫn kiểu ChicagoDoff, Adrian, và Christopher Jones. Language in Use: Upper-intermediate : Self-study Workbook. Cambridge: Cambridge U. P., 1997.
Deismireacht MLADoff, Adrian, và Christopher Jones. Language in Use: Upper-intermediate : Self-study Workbook. Cambridge: Cambridge U. P., 1997.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.