Krull, Greig, and Josep M. Duart. “Research Trends in Mobile Learning in Higher Education: A Systematic Review of Articles (2011 – 2015)”. The International Review of Research in Open and Distributed Learning 18, no. 7 (November 29, 2017). Accessed April 25, 2024. https://www.irrodl.org/index.php/irrodl/article/view/2893.