1Babson Survey Research Group,Sloan Consortium,Pearson.Changing Course:Ten Years of Tracking Online Education in the United States[OL].<http://www.onlinelearningsurvey.com/highered.html.>.
2MIT.About OCW[OL].<http://ocw.mit.edu/about/.>.
32011 Program Evaluation Findings Summary[OL].< http://ocw.mit.edu/about/site-statistics.>.
4George Siemens.Connectivism:A Learning Theory for the Digital Age[OL].<http://www.connectivism.ca.>.
