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Weinberg, R., G. Tenenbaum, A. McKenzie, S. Jackson, M. Anshel, R. Grove and G. Fogarty (2000). Motivation for youth participation in sport and physical activity: Relationships to culture, self-reported activity levels, and gender. International Journal of Sport Psychology 31(3): 321-346. Whitehead, J. R., T. T. Grove, R. H. Brinkert and R. C. Eklund (2000). The effects of perceived activity choice on frequency of exercise behavior. Amercian College of Sports Medicine, Philadelphia PA, Lippincott Williams & Wilkins.
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