- Author: Polanco А.
- Language: Spanish
- Author: Abel Sosa O.
- Language: Spanish
- Author: Lapesa Rafael.
- Language: Spanish
- Author: Eberenz R.
- Language: Spanish
- Author: Covarrubias S.
- Language: Spanish
- Author: Covarrubias S.
- Language: Spanish
- Author: Sánchez S.R.
- Language: Spanish