KIRSCHNER, Paul; MEESTER, Marthie; MIDDELBEEK, Evert. Practical Objectives at the Open University of the Netherlands. International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, [S. l.], v. 6, n. 1, p. 5–27, 1991. Disponível em: https://ijede.ca/index.php/jde/article/view/511. Acesso em: 5 may. 2024.