Veletsianos, George, and Peter Shepherdson. “A Systematic Analysis and Synthesis of the Empirical MOOC Literature Published in 2013–2015”. The International Review of Research in Open and Distributed Learning 17, no. 2 (March 1, 2016). Accessed December 5, 2024. https://www.irrodl.org/index.php/irrodl/article/view/2448.