5Ravi Kalakota, Andrew B, Whinston. Electronic Commerce: A Manager's Guide. Addison - Wesley Press, 1997.
6E. Turban et al. Electronic Commerce: A Managerial Perspective. Prentice Hall Press, 2006.
7Fion S L Lee,Douglas Vogle, Moez Limayem. Virtual Community Inforlnatics: A Review and Research Agenda. Journal of Information Technology Theory and Application, 2003 ; 5 ( 1 ).
8Hagel and Armstrong. Net Gain: Expanding Markets Through Virtual Communities. Harvard Business School Press, 1997.
