Cecchini Estrada, J. A., Fernández Losa, J. L., González González de Mesa, C., Fernández Río, J., & Méndez Giménez, A. (2012). The self determined motivation fall in school kids. SPORT TK-EuroAmerican Journal of Sport Sciences, 1(1), 25–31. https://doi.org/10.6018/185531