Delgado Heredia PD, Carrera Moreno GW. Pronunciation difficulties among ecuadorian efl students: causes and classroom solutions. Sap Sci [Internet]. 15 de julio de 2026 [citado 15 de julio de 2026];9(20):508-33. Disponible en: https://publicacionescd.uleam.edu.ec/index.php/sapientiae/article/view/2053