1. Raymond Murphy: English Grammar in Use (Third Edition). Cambridge University Press 2004
2. Bill Mascull: Business Vocabulary in Use Intermediate and Advanced (Second Editions). Cambridge University Press
3. Michael McCarthy , Jeanne McCarten, David Clark and Rachel Clark: Grammar for Business. Cambride University Press
4. B. Jean Naterop and Rod Revell: Telephoning in English Intermediate and Upper Intermediate (Third Edition). Cambridge University Press
5. Michael Duckworth: Business Grammar and Practice (Intermediate to Upper- Intermediate. Oxford University Press 2003
Oxford University Press