1. Alonso, O. y C. del Río. 2010. Occupational segregation of immigrants in Spain. Madrid: Instituto de Estudios Fiscales.
2. El observatorio de la crisis: lecciones sobre la necesidad de reformas laborales;Anghel;Papeles de Economía Espa-ola,2010
3. Why Do Blacks and Women Have High Unemployment Rates?
4. Becker, G. S. 1975. Human capital. A theoretical and empirical analysis, with special reference to education. Chicago: University of Chicago Press.
5. Is There a New Service Proletariat? Post-industrial Employment Growth and Social Inequality in Spain