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Biddle, S. J. H.; Nigg, C. R. (2000). Theories of exercise behavior. International Journal of Sport Psychology, 31, pp. 290-304. Edizioni Luigi Pozzi
Nigg, C. R.; Paxton, R. (2008). Conceptual perspectives used to understand youth physical activity and inactivity. In: Smith, A. L.; Biddle, S. J. H. (eds.) Youth Physical Activity and Inactivity: Challenges and Solutions (pp. 79-113). Champaign, IL: Human Kinetics
