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Nigg, C. R. (2003). Do Sport Participation Motivations Add to the Transtheoretical Model Applied to Adolescent Exercise Behavior? International Journal of Sport Psychology, 34, pp. 208-225. Edizioni Luigi Pozzi
Biddle, S. J. H.; Nigg, C. R. (2000). Theories of exercise behavior. International Journal of Sport Psychology, 31, pp. 290-304. Edizioni Luigi Pozzi