1. Basabe, Nekane, Zlobina, Anna, and Páez, Darío (2004). Integración Socio-Cultural y Adaptación Psicológica de los Inmigrantes Extranjeros en el País Vasco, Servicio Central de Publicaciones del Gobierno Vasco. Cuadernos Sociológicos Vascos.
2. Becker, Gary (1964). Human Capital: A Theoretical and Empirical Analysis, with Special Reference to Education, National Bureau of Economic Research.
3. Berlin, Isaiah (1969). Four Essays on Liberty, Oxford University Press.
4. Blaikie, Norman (2010). Designing Social Research, Polity Press. [2nd ed.].
5. Using thematic analysis in psychology;Braun;Qualitative Research in Psychology,2006