E. M. Yunga Albán, M. E. Coca Naranjo, T. C. Barreno Noriega, G. I. Mejía Ortiz, y W. P. Pérez Bonifaz, «Difficulties in learning English among Ecuadorian elementary students: causes and solutions»., ASCE, vol. 4, n.º 2, pp. 565–582, may 2025.