1. My life philosophy;Allais;Am. Econ.,1989
2. Inquiry into the working methods of mathematicians;Claparède,1902
3. Beyond Boredom and Anxiety;Csikszentmihalyi,1975
4. Leisure and self-actualization;Csikszentmihalyi,1991
5. Scientists: Their Psychological World;Eiduson,1962