1. Business Week, “Will the boss go electronic, too?” pp 106–108, May 11,1981.
2. S. K. Card, W. K. English, and B. Burr “Evaluation of mouse, rate-controlled isometric joystick, step keys, and text keys for text selection on a CRT”, Xerox Palo Alto Research Center SSL-77–1, April, 1977.
3. L. A. Conway, A. G. Bell, and M. E. Newell, “MPC79: The Large-Scale Demonstration of a 4 New Way to Create Systems in Silicon,”Lambda—The Magazine of VLSI Design, pp. 10–19, Second Quarter, 1980.
4. D. C. Englebart, “X-Y position indicator for a display system”, U. S. Patent 3,541,541. Nov. 17, 1970.
5. D. C. Englebart and W. K. English, “A Research Center for Augmenting Human Intellect”, FJCC 1968, Thompson Books, Washington Books, Washington, D. C., p. 395.