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- Language: German
- Year: 2010
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- Language: German
- Year: 2001
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- Language: German
- Year: 2010
- Author: Knut Hickethier Katja Schumann
- Language: German
- Year: 2005
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- Language: German
- Year: 2007
- Author: Theodor Pelster
- Language: German
- Year: 2004
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- Language: German
- Year: 2004
- Author: Helmut Bernsmeier
- Language: German
- Year: 2002
- Author: Theodor Pelster
- Language: German
- Year: 2003
- Author: Walburga Freund-Spork
- Language: German
- Year: 2003