Dueñas Macías, Fredy. Learner-Centered Curriculum: A Step Towards English Speaking Skill Improvement of Non-English Teachers. ENLETAWA JOURNAL, no. 3 Jan (mayo 31, 2013). Accedido marzo 5, 2021. https://revistas.uptc.edu.co/index.php/enletawa_journal/article/view/1937.