Reid, M., Crespo, M., Santilli, L., Miley, D. y Dimmock, J. (2007). The importance of the International Tennis Federation’s junior boys’ circuit in the development of professional tennis players. Journal Sports Sciences, 25(6), 667-672. Unierzyski, P., y Crespo, M. (2007). Review of modern teaching methods for tennis. International Journal of Sport Science, 3(7), 1-10.