L. O. Achmad Suherman, W. O. Riniati, S. Sukwara Akfan, M. Munirah, N. Dian Utami, and F. Fitriani, “Utilizing Mobile-Assisted Language Learning (Duolingo) to Foster Metacognitive Awareness and Self-Directed Learning in Non-English Major Students”, ELS-JISH, vol. 8, no. 1, pp. 235–244, Mar. 2025.