Mtebe, Joel S., and Roope Raisamo. “Investigating Perceived Barriers to the Use of Open Educational Resources in Higher Education in Tanzania”. The International Review of Research in Open and Distributed Learning 15, no. 2 (April 11, 2014). Accessed April 20, 2019. http://www.irrodl.org/index.php/irrodl/article/view/1803.