1. I. Sutherland. The Ultimate Display. In Proceedings of the IFIP Congress, pp. 506–508, 1965.
2. J. C. Zeng, Z. H. Yu. Virtual Reality Technology and Its Application, Tsinghua University Press, Beijing, PRC, 1996. (in Chinese)
3. S. Aukstakalnis, D. Blatner. Silicon Mirage: The Art and Science of Virtual Reality, Peachpit Press Berkeley, CA, USA, 1992.
4. Z. X. Zhao. Virtual Reality Technology: An Overview. Journal of Southeast University, vol. 32, no. 2A, pp. 1–10, 2002. (in Chinese)
5. J. Locke. An Essay Concerning Human Understanding, The Commercial Press, Beijing, PRC, 1997.