6B. Bloom, The 2 Sigma Problem : The Search for Methods of Group Instruction as Effective as One - to -One Tutoring, Educational Researcher, 6 (1984): 4 -16.
7Kolowich, Steve. The MOOC Disruption Proves Less Than Revolutionary After All [J]. Chronicle of Higher Education, 2013, Vol. 59 Issue 45.
8DEVLIN K. MOOC Mania Meets the SoberReality of Education [EB/OL]. (2013-08-19)[2013-12-07].http://www.huffingtonpost.com/dr-keith-devlin/mooc_b_3741625.html.