SFENRIANTO, S.; HARTARTO, Y. B.; AKBAR, H.; MUKHTAR, M.; EFRIADI, E.; WAHYUDI, M. An Adaptive Learning System based on Knowledge Level for English Learning. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 13, n. 12, p. pp. 191–200, 2018. DOI: 10.3991/ijet.v13i12.8004. Disponível em: https://online-journals.org/index.php/i-jet/article/view/8004. Acesso em: 19 jan. 2022.