Solana, Miguel, Verónica de Miguel Luken, Dan Rodríguez García, and Àngels Pascual de Sans. 2013. “Official Language Knowledge Among Foreign-Born Immigrants in Catalonia, Spain, and Implications for Their Social Integration”. Migraciones. Publicación Del Instituto Universitario De Estudios Sobre Migraciones, no. 32 (February): 103-38. https://revistas.comillas.edu/revistamigraciones/article/view/910.