| 1 | Cotton, David Falvey David, Kent Simon with Rogers John New Edition Market Leader, Pre-Intermediate Business English Course Book, Pearson Longman and Financial Times, 2008, Edinburg Gate, Harlow, England. |
| 2 | Rogers John, New Edition Market Leader, Pre-Intermediate Business English Practice File, Pearson Longman and Financial Times, 2007, Edinburg Gate, Harlow, England. |