NGUYEN, T. C.; LE, C. T. A case study by using Khan Academy, an open-source environment. Journal of Contemporary Educational Policies and Practices, [S. l.], v. 4, n. 4, p. 22–27, 2020. DOI: 10.52296/vje.2020.76. Disponível em: https://jcepp.org/index.php/journal/article/view/76. Acesso em: 29 jan. 2026.