- Variation in German: A Critical Approach to German Sociolinguistics
- Language and Migration in a Multilingual Metropolis: Berlin Lives
- Language and German Disunity: A Sociolinguistic History of East and West in Germany, 1945-2000
- Language, Discourse and Identity in Central Europe: The German Language in a Multilingual Space
- The German-Speaking World: A Practical Introduction to Sociolinguistic Issues