- Author: Lucy Michael, Samantha Schulz
- Language: English
- Year: 2014
- Author: Michael S. Schulz
- Language: English
- Year: 2017
- Author: Michael S. Schulz
- Language: English
- Year: 2017
- Author: Michael S. Schulz
- Language: English
- Year: 2017
- Author: Michael H. Schulz (auth.)
- Language: German
- Year: 1988