Graham, Keith M., Sharon D. Matthews, and Zohreh R. Eslami. “Using Children’s Literature to Teach the 4Cs of CLIL: A Systematic Review of EFL Studies”. Latin American Journal of Content & Language Integrated Learning 13, no. 2 (January 14, 2021): 163–189. Accessed October 19, 2021. https://laclil.unisabana.edu.co/index.php/LACLIL/article/view/12255.