1. Bonk C. & Cunningham D. (1998). Searching for learner-centered constructivist and socioculturel components of collaborative educational learning tools. In C. Bonk & K King (Eds.) Electronic collaborators. Mabwah NJ: Erlbaum Morris D. Mason J- & Lefrere P. (2003). Transforming e-knowledge. Ann Arbor MI: Society for College and University Planning.