- Author: Edmund de Chasca
- Language: Spanish
- Year: 1967
- Author: Helmut Hatzfeld
- Language: Spanish
- Year: 1973
- Author: Miguel Batllori
- Language: Spanish
- Year: 1966
- Author: Geoffrey Barraclough
- Language: Spanish
- Year: 1965
- Author: James Jerome Murphy
- Language: Spanish
- Year: 1989
- Author: Guirnalda de Filipo., Guillermo Galán Vioque
- Language: Spanish
- Year: 2004
Sociolingüística
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- Author: Humberto López Morales
- Language: Spanish
- Year: 1993
- Author: Joan Corominas José A. Pascual
- Language: Spanish
- Year: 1980
- Author: Coromines J. Pascual J.
- Language: Spanish
- Year: 2010