- Author: Jacob Aagaard
- Language: English
- Year: 2010
- Author: Luis Miguel Alonso Gutiérrez
- Language: Spanish
- Year: 2010
- Author: Lafora Carlos R.
- Language: Spanish
- Year: 1965
- Author: Jose Monedero Gonzalez Antonio Lopez Manzano
- Language: Spanish
- Year: 2002
- Author: V.N. Panov - Y.B. Estrin
- Language: Spanish
- Year: 1980
- Author: Martin Angel
- Language: Spanish
- Year: 2011
- Author: Francisco Fernandez Lozano
- Language: Spanish
- Year: 2014
- Author: Fred Wilson
- Language: Spanish
- Year: 1981
- Author: Capablanca José Raúl
- Language: Spanish
- Year: 1967