- Author: Ingo Plag, Maria Braun, Sabine Lappe, Mareile Schramm
- Language: English
- Year: 2011
- Author: Ingo Plag, Maria Braun, Sabine Lappe, Mareile Schramm
- Language: English
- Year: 2009
- Author: Sabine Lappe
- Language: English
- Year: 2007
- Author: Sabine Lappe (auth.)
- Language: English
- Year: 2007