- Author: David Nugent
- Language: Spanish
- Year: 1988
- Author: Santiago Araujo
- Language: Spanish
- Year: 2003
- Author: Edison Macías Núñez
- Language: Spanish
- Year: 2004
- Author: Florencia Mallon (aut.), Lilyán de la Vega (trad.)
- Language: Spanish
- Year: 2003
- Author: Consorcio de Investigación Económica y Social (CIES)
- Language: Spanish
- Year: 2014