Practice in English
Posner, M.

English Verbs and Tenses
Bourke, Kenna

English Grammar in Use
Murphy, Raymond

Let's get moving
Gegier, Birgit

Business Focus Pre-Intermediate Tea
Grant, David; McLarty, Robert

Nelson`s Junior English Dictionary
Witty

Englisch: Vorsicht, Fehler!
Freese

Nobody is perfect
Nuffer, Hannelore

We mean Business
Norman

Wirtschaftsenglisch
Baddock, Barry