Focus on Modern Business 1 Extra Pr

The American Heritage Dictionary

English in Mind 1 Teacher's Book
Puchta, Herbert ua

Advanced Grammar in Use
Hewings, Martin

Business Builders 1, 2, 3
Emmerson, Paul

Visual Dictionary
Corbeil/Mouser

Increase your wordpower 2
Woxbrandt / Kunze

Englische Wirtschaftssprache
Obenaus/Weidacher

Well Spoken
Ramsey

English Vocabulary in Use
McCarthy, Michael u.a.