Cultural Awareness
Tomalin, Barry

Longman Commercial Communication
Stanton/Wood

Drugs and Crime
Forster, Marcella

Objective PET for Schools
Hashemi, Louise

Practical English Usage
Swan, Michael

If-Clauses & Co Die Nebensätze
Groß, Achim

Oxford Advanced Learner's Dictionay
Hornby

Situational Grammar Practice

The American Heritage Dictionary

Harrap's Easy English Dictionary
Pons