1. SYMLOG a system for the multiple level observation of groups;Bales,1979
2. The strategic role of e-branding;Bateman,2001
3. Cognition;Benjafield,1992
4. Bonett, M. (2001). Personalization of Web Services: Opportunities and Challenges. Ariadne Issue 28, June 2001, http://www.ariadne.ac.uk/issue28/personalization/.
5. Brinck, T., Gergle, D., & Wood, D. S. (2001). Usability for the web. Los Altos, CA: Morgan Kaufmann, New York: Academic Press.