1. Frieson N . Report: Defining Blended Learning [Internet], 2016. Available: http://bit.ly/21QMDlM [Accessed 20 Oct 2019].
2. Weller M . Virtual learning environments: using, choosing, and developing your VLE. Abingdon, UK: Routledge, 2007.
3. Rouse M . Virtual learning environment (VLE) or managed learning environment (MLE) [Internet], 2011. Available: http://bit.ly/1uTpPkH [Accessed 17 Oct 2019].
4. Naidu S . Enabling Time, Pace, and Place Independence. In: Spector J , Merrill M , Merriënboer J , et al , eds. Handbook of research on educational communications and technology. New York: Routledge, 2008.
5. Student perceptions of a virtual learning environment for a problem-based learning undergraduate medical curriculum;de Leng;Med Educ,2006