- Author: Luis David Pérez Pérez
- Language: Spanish, Castilian
- Year: 2017
- Author: Sykes Timothy
- Language: English
- Year: 2008
- Author: Patterson Scott
- Language: English
- Year: 2012
- Author: Hanke Ulrich W
- Language: German
- Year: 2016
- Author: Lynn Andrea
- Language: English
- Year: 2011
- Author: Piper John
- Language: English
- Year: 1999