KIRBY, David. The Next Frontier: Graduate Education at a Distance. International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, [S. l.], v. 3, n. 2, p. 115–121, 1988. Disponível em: https://ijede.ca/index.php/jde/article/view/552. Acesso em: 27 apr. 2024.