Alavi, Sayyed Mohammad, and Mahboubeh Taghizadeh. “Cognitive Presence in A Virtual Learning Community: An EFL Case”. International Journal of E-Learning & Distance Education Revue Internationale Du E-Learning Et La Formation à Distance, vol. 27, no. 1, July 2013, https://www.ijede.ca/index.php/jde/article/view/818.