Pribadi, Benny Agus, and Kwan Sik Chung. “Designing Online Learning: Comparative Study Between Indonesian Open University and Korea National Open University”. International Journal of Instruction 16, no. 2 (April 1, 2023): 643–660. Accessed July 2, 2025. https://e-iji.net/ats/index.php/pub/article/view/161.