Zentgraf, M. C. (1992) “The positions of specialists on distance education and on higher education supervision in relation to specialization and upgrading distance education courses”, International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, 7(3), pp. 65–80. Available at: https://ijede.ca/index.php/jde/article/view/505 (Accessed: 4 May 2024).