Dillon, C. L., Hengst, H. R. and Zoller, D. (1991) “Instructional Strategies and Student Involvement in Distance Education: A Study of the Oklahoma Televised Instruction System”, International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, 6(1), pp. 28–41. Available at: https://ijede.ca/index.php/jde/article/view/392 (Accessed: 28 April 2024).