| Countdown to First Certificate. Students Book | Duckworth, Michael | |
| Countdown to First Certificate. Students Book | Duckworth, Michael | |
| Countdown to First Certificate. Workbook und CDs | Duckworth, Michael | |
| Countdown to First Certificate. Workbook mit Key | Duckworth, Michael | |
| Countdown to First Certificate. Class CDs | Duckworth, Michael | |
| Business Result. Upper-Intermediate. Student's | Duckworth, Michael | |
| Oxford Business English. Business Grammar and | Duckworth, Michael | |
| Quick Work. Intermediate. Workbook | Duckworth, Michael | |
| Business Result Pre-Intermediate - Student's Pack | Duckworth, Michael | |
| Business Result Advanced - Student's Pack | Duckworth, Michael | |
| Business Grammar and Practice. Elementary. | Duckworth, Michael | |
| Business Result Upper-Intermediate | Duckworth, Michael |
