1. Csikszentmihályi, M. (1990). Flow: The psychology of optimal experience. Harper & Row. ISBN: 978-0-06-016253-5.
2. Lynch, D. (1984). Your high performance business brain. Englewood Cliffs, NJ: Prentice Hall.
3. Pink, D. H. (2009). Drive: The surprising truth about what motivates us. New York: Riverhead Books.
4. Ramadhar, S. (1988). Life performance = motivation x ability x opportunity: Individual differences in predictive models. Genetic Social and General Psychology Monographs, 114, 191–210.
5. Rosenthal, R., & Fode, K. (1963). The effect of experimenter bias on performance of the albino rat. Behavioral Science, 8, 183–189.