Yousef, Ahmed Mohamed Fahmy, Mohamed Amine Chatti, Ulrik Schroeder, and Marold Wosnitza. “A Usability Evaluation of a Blended MOOC Environment: An Experimental Case Study”. The International Review of Research in Open and Distributed Learning 16, no. 2 (April 15, 2015). Accessed November 21, 2019. http://www.irrodl.org/index.php/irrodl/article/view/2032.