
- Author: De Louw Rudi
- Language: English
- Year: 2016

- Author: De Louw Rudi
- Language: English
- Year: 2016

- Author: Bönnen Carsten, Drees Volker, Fischer André, Heinz Ludwig, Strothmann Karsten
- Language: English
- Year: 2016

- Author: Bönnen Carsten, Drees Volker, Fischer André, Heinz Ludwig, Strothmann Karsten
- Language: English
- Year: 2016

- Author: Dickersbach Jörg Thomas
- Language: English
- Year: 2009

- Author: Bilay John Mutumba, Blanco Roberto Viana
- Language: English
- Year: 2017

- Author: Witt Andreas
- Language: German
- Year: 2014

- Author: Markand Andrea, Markand Markus, Meyers Marion
- Language: German
- Year: 2016