Serrano Romero, Enriqueta Claudia. “Natural Approach or Cognitive Approach. Learning or Acquiring a Foreign Language? Research Study at Centro De Lenguas De La Universidad Autónoma De Ciudad Juárez”. The International Human Sciences Review 10 (October 31, 2019): 49-58. Accessed September 28, 2020. https://journals.eagora.org/HUMANrev/article/view/2003.