2Kaur, M. Blended Learning - its Challenges and Future [J]. So- cial and Behavioral Sciences, 2013, (93) : 612- 617.
3Siemens,G. How to Participate in an Open Online Course [ E B/O L 3.http://gsiemens.tumblrcom/post/10153633521/how-to- participate-in-an-open- online-course. 2011.