1. Allen, M., Mabry, E., Mattrey, M., Bourhis, J., Titsworth, S., Burrell, N.: Evaluating the effectiveness of distance learning: A comparison using meta-analysis. Journal of Communication 54(3), 402–420 (2004)
2. Allen, I.E., Seaman, J.: Going the Distance: Online Education in the United States. In: ERIC 2011 (2011)
3. Lecture Notes in Computer Science;E. Frías-Martínez,2004
4. Havice, P.A., Foxx, K.W., Davis, T.T., Havice, W.L.: The Impact of rich media presentations on a distributed learning environment. Quarterly Review of Distance Education 11(1), 53 (2010)
5. Jang, J.S.R., Sun, C.T., Mizutani, E.: Neuro-Fuzzy and Soft Computing-A Computational Approach to Learning and Machine Intelligence. Prentice Hall inc (1997)