Ahuja, M. K. & Galvin, J. E. (2003). Socialization in virtual groups, Journal of Management, 29(2), 161-185.
Gorghiu, G., Lindfors, E., Gorghiu, L.M., Hämäläinen, T. (2011). Acting as Tutors in the ECSUT On-line Course - How to Promote Interaction in a Computer Supported Collaborative Learning Environment? Procedia Computer Science, 3(1) 579-583.
Granovetter, M. S. (1982). ‘The strength of weak ties: a network theory revisited’, in Social Structure and Network Analysis, ed. P. V. Marsden & N. Lin, Sage, Beverly Hills, 105-130.
Haythornthwaite, C. (2005). Social networks and internet connectivity effects. Information, Communication & Society Vol. 8, No. 2, 125–142.
Hillen, S. & Paivarinta,T. ( 2012). Perceived Support in E-Collaborative Learning: An Exploratory Study Which Make Use of Synchronous and Asynchronous Online-Teaching Approaches. Advances in Web-Based Learning - ICWL 2012. Lecture Notes in Computer Science Volume 7558, 2012, 11-20.
Kopp, B., Matteucci, M.C., Tomasetto, C. (2012). E-tutorial support for collaborative online learning: An explorative study. Computers & Education, 58(1), 12-20, 3270-3273.
Lojeski, K. (2006). Virtual Distance. A proposed model for the study of virtual work. Stevens Institute of Technology. Dissertation.
Lojeski K. S., London, M. & Reilly, R. (n. d.). The Role of Virtual Distance and Group Learning: A Case Study from Big Pharma and Financial Services. Retrieved 17.01.2013 http://www.industrystudies.pitt.edu/pittsburgh11/documents/Papers/PDF%20Papers/7-6%20Sobel%20Lojeski.pdf