
- Author: Roberto Escobar Gaviria, David Fisher
- Language: English
- Year: 2009

- Author: Roberto Escobar, David Fisher
- Language: English
- Year: 2009

- Author: Roberto Escobar David Fisher
- Language: English
- Year: 2009

- Author: Roberto Escobar
- Language: English
- Year: 2009

- Author: Roberto Escobar
- Language: English
- Year: 2009