Sfenrianto S, Hartarto YB, Akbar H, Mukhtar M, Efriadi E, Wahyudi M. An Adaptive Learning System based on Knowledge Level for English Learning. Int. J. Emerg. Technol. Learn. [Internet]. 2018 Dec. 20 [cited 2024 Nov. 22];13(12):pp. 191-200. Available from: https://online-journals.org/index.php/i-jet/article/view/8004