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http://www.habe.euskadi.eus/s23-4728/es/contenidos/noticia/aisa/es_12745/aisa.html
. Accessed 31 October 2017.
4. Basque Government. (2011a). Third Basque plan of immigration citizenship and intercultural cohabitation 2011–2013/III Plan Vasco De Inmigración, Ciudadanía y Convivencia Intercultural (III PVICCI) 2011–2013. Vitoria-Gasteiz.
5. Basque Government. (2011b). V Sociolinguistic Survey/ V Encuesta Sociolingüística. Vitoria-Gasteiz.