Almeida, Evelyn, Diana Castillo, y Soledad Parra. «Developing Awareness of Unknown Sounds to Improve Merging and Substitution Pronunciation Mistakes». INNOVA Research Journal 3, no. 4 (abril 4, 2018): 44–56. Accedido abril 28, 2024. https://revistas.uide.edu.ec/index.php/innova/article/view/476.