English Grammar in Use
Murphy, Raymond

Toxic Waste and Recycling
Hawkes, Nigel

The American Coloniel Experience
Goodman/Gatell

Dictionary odf Common Errors
Heaton/Turton

English Grammar Exercises
Hoffmann/Schmidt

A Commercial Course
Eckersley/Kaufmann

Commercial Correspondence
Ashley, A.

Keep it up! 2 7./8.Klasse
Mentor Lernhilfen Englisch

Living English Structure
Allan, W.Stannard

English Synonyms
Ruff