Barón Ávila, Andrés. “Bilingualism Models: Do They Strengthen or Weaken the Oral Communicative Process in Contexts of English As a Foreign Language in Fifth Grade Primary Students?”. GIST – Education and Learning Research Journal, no. 4 (November 1, 2010): 50 - 61. Accessed April 22, 2021. https://latinjournal.org/index.php/gist/article/view/584.