Reju, Comfort Okwuegbune, and Loyiso Jita. “Instructional Delivery and Students’ Experiences With Distance and Online Learning of Undergraduate Mathematics in Nigeria”. The International Review of Research in Open and Distributed Learning 19, no. 2 (May 1, 2018). Accessed April 20, 2019. http://www.irrodl.org/index.php/irrodl/article/view/3196.