1. Anderson, J. R. (1983). The architecture of cognition. Cambridge, MA: Harvard University Press.
2. Beard, D., Palaniappan, M., Humm, A., Banks, D., Nair, A., and Shan, Y-P. (1990). A visual calendar for scheduling group meetings. Rocccdings of C S C W '90, 279-290. New York: ACM.
3. Card, S. K., Moran, T . P. & Newell, A. (1983). The psychology of human-computer interaction. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.
4. CarroI1, J. M., Kellogg, W. A. & Rosson, M. B. (1991). The task-artifact cycle. In J. M. Carroll (Ed.), Dcsiping interaction (pp. 74-102). New York: Cambridge University Press.
5. Conway, M. A. & Gathercole, S. E. (1990). Writing and long-term memory: Evidence for a "translationn hypothesis. Quarierb Journal of Exp~~imental Psychology, 3, 513-528.