6Christensen, C, Horn, et al. Is K - 12 blended learning disruptive? an introduction of the theory of hybrids[EB/OL].[2015-12-22], http:// www.ehristenseninstitute.org/publications/hybrids.
7Powerll A O, Verma S. Blending teaming:the evolution of online and Face-to-Face education from 2008 - 2015 [EB/OL]. [2015 -12 -22]. http://www.inacol.org/resource/blending -learning -the -evolution -of - online-and-face-to-face-education-from-2008-2015.
8Guy,M..How do different eLeaming methods affect knowledge reten- tion?[EB/OL].[2015 -12 -22].http://elearningtransforms.com/knowledge -retentio/.
9Robin,H. How to ..' Evaluate Blended Learning. [EB/OL].[2015-12- 22]. http:Hwww.peoplemgmt.com/.