Álvarez-Sotomayor, A. “Spanish Language Proficiency and the Academic Gap Between Children of Immigrants and Native Students in Spain: Evidence from a Case Study”. International Journal of Sociology of Education, vol. 10, no. 3, Oct. 2021, pp. 218-45, https://hipatiapress.com/hpjournals/index.php/rise/article/view/7223.