- Author: Harri Kettunen, Christophe Helmke
- Language: Spanish
- Year: 2004
- Author: Harri Kettunen Christophe Helmke
- Language: English
- Year: 2020
- Author: Harri Kettunen Christophe Helmke
- Language: Castellano
- Year: 2011
- Author: Harri Kettunen Christophe Helmke
- Language: English
- Year: 2014
- Author: Harri Kettunen Christophe Helmke
- Language: English
- Year: 2008