ClarkeD. H., & VaccaroP.The effect of swimming training on muscular performance and body composition in children. Research Quarterly, 1979, 50, 9–17.
3.
CummingG. R.The child in sport and physical activity: Medical comment. In AlbinsonJ. G. & AndrewG. M. (Eds.), Child in sport and physical activity. Baltimore: University Park Press, 1976. Pp. 67–81.
4.
MagillR. A., & AshM. J.Academic, psycho-social, and motor characteristics of participants and nonparticipants in children's sport. Research Quarterly, 1979, 50, 230–240.