1Elaine Allen,Jeff Seaman. Changing Course-Ten Years of Tracking Online Education in the United States[EB/OL].http://sloanconsortium.org/publications/survey/changing_course_2012,2013.
2James G.Mazoue. The MOOC Model:Challenging Traditional Education[EB/OL].http://www.educause.edu/ero/article/mooc-model-challenging-traditional-education,2013.