Hewitt, E. C., and E. García-Sánchez. “The Evolution of Content and Language Integrated Learning (CLIL) in Spain: An Empirical Project at the University Level”. Latin American Journal of Content &Amp; Language Integrated Learning, vol. 5, no. 1, Apr. 2012, pp. 57-67, doi:10.5294/laclil.2012.5.1.5.