Abbey, B. (2000). Instructional and cognitive impacts of web-based education. IDEA Group Aggarwal, A. (2001). Web-Based Learning and Teaching Technologies: Opportunities and Challenges. London: Idea Group Pub. Armstrong, A.M. (2003). Instructional Design in the Real World: A View from the Trenches (Advanced Topics in Information Resources Management). Information Science Publishing. Barab, S. y otros. (2004).Designing Virtual Communities in the Service of Learning. Cambridge: Cambridge University Press. Brooks, D. Web-Teaching: A Guide to Designing Interactive Teaching for the World Wide Web. Kluwer Academic Publishers. Carliner, S. (2002). Designing E-Learning. ASTD. Carliner, S: (2003).Training design basics. Wahington:ASTD . Clark, R.E. (2001).Learning From Media:Arguments,Analysis and Evidence (A volume in Perspectives in Instructional Technology and Distance Learning).Information Age Publishing. Discenza, R. (2002).The Design and Management of Effective Distance Learning P: nullnull