1. Top 15 most popular web 2.0 user generated content,
http://www.ebizmba.com/articles/web-2.0-websites
(retrieved June 15, 2011)
2. Jacob, G.M., Gan, S.L., Ball, J.: Cooperative Learning. Penerbit Universiti Putera Malaysia, Serdang (1998)
3. Siti Rosni, M.Y.: The Usability of Open Content Initiatives in Computer Support Collaborative Learning activities in Higher Education. In: GloCALL International Conference on Globalization & Localization in CALL (2010)
4. Paloff, R.M., Pratt, K.: Collaborating Online. Jossey-Bass, San Francisco (2005)
5. Cabelle, S., Xhafa, F.: Providing Software Infrastructure for the Systematic and Effective Construction of Complex Collaborative Systems. The Journal of Systems and Software (2008)