HOLMBERG, Börje. Thirty Years Later: A Discipline of Distance Education. International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, [S. l.], v. 31, n. 2, 2016. Disponível em: https://www.ijede.ca/index.php/jde/article/view/1001. Acesso em: 23 apr. 2024.