Shavelson, Richard J., Noreen M. Webb, and John Y. Hotta. 1987. “The Concept of Exchangeability in Designing Telecourse Evaluations”. International Journal of E-Learning & Distance Education Revue Internationale Du E-Learning Et La Formation à Distance 2 (1):27-40. https://www.ijede.ca/index.php/jde/article/view/311.