Business Builders 1, 2, 3
Emmerson, Paul

Basic English Usage
Swan, Michael

Source Book for Teaching English
Lewis, Michael / Hill, Jimmie

Appetizer English
Armbrust, Laura

Business Opportunities-Teacher`
Hollett, Vicki

English Grammar in Use Supplementar
Hashemi, Lousie

Ask and Answer
Rohrauer/schönberger

Dictionary of Common Errors
Heaton/Turton

Teste dein Englisch
Broughton

Youth and Employment in Modern Brit
Roberts, Kenneth