Nuviala Nuviala, A., Munguía Izquierdo, D., Fernández Martínez, A., Ruiz Juan, F., & García Montes, M. E. (2009). Typologies of occupation of leisure-time of Spanish adolescents: The case of the participants in physical activities organized. Journal of Human Sport and Exercise, 4(1), 29–39. https://doi.org/10.4100/jhse.2009.41.04