1. Bennett, G. K., Seashore, H. G. & Wesman, A. G. 1973, Differential aptitude tests, forms S and T, The Psychological Corporation, New York.
2. College Entrance Examination Board, 1939, CEEB Special Aptitude Test in Spatial Relations, USA.
3. Dreyfus, H. L. & Dreyfus, S. E. 1986, Mind over Machine, Free Press, New York.
4. Eyal, R. & Tendick, F. 2001, “Spatial ability and learning the use of an angled laparoscope in a virtual environment”, Medicine Meets Virtual Reality, Westwood, J. D. (editors), IOS Press, Amsterdam, pp. 146–152.
5. Gimmestad, B. J. 1989, “Gender differences in spatial visualization and predictors of success in an engineering design course”, Proceedings of the National Conference on Women in Mathematics and the Sciences, St. Cloud, MN, pp. 133–136.