Zawacki-Richter, Olaf, Wolfgang Müskens, Ulrike Krause, Uthman Alturki, and Ahmed Aldraiweesh. “Student Media Usage Patterns and Non-Traditional Learning in Higher Education”. The International Review of Research in Open and Distributed Learning 16, no. 2 (April 15, 2015). Accessed May 27, 2019. http://www.irrodl.org/index.php/irrodl/article/view/1979.