Handbuch der englischen Wirtschafte
Langenscheidt

Amerikanisch compact
Rink

Visual Dictionary
Merriam-Webster's

The Heinemann English Grammar

Increase your wordpower
Woxbrandt / Kunze

Guided Course in English Compositin
Jupp/Milne

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

Focus 1 Extra Practice
Deane Neil, Hine Elizabeth

How to teach writing
Harmer, Jeremy

A Commercial Course
Eckersley/Kaufmann