Kaplan R. The Media and Medievalism
Utz S. Social information processing in MUDs: The development of friendships in virtual worlds // Journal of Online Behavior. 2000. Vol. 1. № 1. [online]. Date of access – 2001. April 10. http://www.behavior.net/job/vlnl/utz.html
Van Alstyne M., Brynjolfsson E. Electronic communities: Global Village or cyberbalkans? [Online] Date of access – 2001. June 25. http://web.mit.edu/marshall/www/papers/CyberBalkans.pdf