FARAJOLLAHI, M., H. ZARE, M. HORMOZI, M. R. SARMADI, and H. ZARIFSANAEE. “A Conceptual Model for Effective Distance Higher Education in Iran”. Asian Journal of Distance Education, Vol. 8, no. 2, Jan. 2010, pp. 18-28, https://asianjde.com/ojs/index.php/AsianJDE/article/view/166.