Sylvia, Sylvia, et al. “Massive Open Online Courses (MOOCs) in English As a Foreign Language Learning: A Systematic Review”. Proceedings of Forum for University Scholars in Interdisciplinary Opportunities and Networking, vol. 2, no. 1, Dec. 2025, pp. 415-23, https://conference.ut.ac.id/index.php/fusion/article/view/6746.