1. Adelskold, G., Alklett, K., Axelsson, R., & Blomgren, G. (1999). Problem-based distance learning of energy issues via computer network. Distance Education, 20(1), 129–143.
2. Anderson, S. E., & Harris, J. B. (1997). Factors associated with amount of use and benefits obtained by users of a statewide educational telecomputing network. Educational Technology Research and Development, 45(1), 19–50.
3. Aronson, E., Blaney, N., Sikes, J., & Snapp, M. (1978). The Jigsaw classroom. Beverly Hills: Sage.
4. Berge, Z. L. (1999). Interaction in post-secondary web-based learning. Educational Technology, 39(1), 5–11.
5. Brewer, S. A. (2004). Small group learning in an online asynchronous environment. Unpublished doctoral dissertation, Arizona State University.