- Author: Ingo Plag, Maria Braun, Sabine Lappe, Mareile Schramm
- Language: English
- Year: 2011
- Author: Ingo Plag, Sabine Arndt-Lappe, Maria Braun, Mareile Schramm
- Language: English
- Year: 2015
- Author: Ingo Plag, Sabine Arndt-Lappe, Maria Braun, Mareile Schramm
- Language: English
- Year: 2015
- Author: Ingo Plag, Maria Braun, Sabine Lappe, Mareile Schramm
- Language: English
- Year: 2009
- Author: Mareile Schramm
- Language: English
- Year: 2014
- Author: Mareile Schramm
- Language: English
- Year: 2014