1. Card, S., Moran, T., & Newell, A. (1983). The psychology of human-computer interaction. Hillsdale, NJ: Erlbaum.
2. Derrick, W. L. (1988). Dimensions of operator workload. Human Factors, 30, 95–110.
3. Kahneman, D. (1973). Attention and effort. Englewood Cliffs, NJ: Prentice-Hall.
4. Kantowitz, B., & Sorkin, R. (1983). Human factors: Understanding people-system relationships. New York: Wiley.
5. Ledgard, H. F., Whiteside, J. A., Seymour, W., & Singer, A. (1980). An experiment on human engineering of interactive software. IEEE Transactions on Software Engineering, 6, 602–604.