1. Alvero, J.R., Barrera, J., and Mesa, A. (2006). Correlations of physiological responses in squash players during competition. Paper presented at the Proceedings of the IV World Congress of Science and Racket Sports, Alcoy: Alto Rendimiento.
2. Registro Profesional de Tenis. (2002). Programa de formacion para directores, coaches y profesionales de la enseilanza del tenis. Madrid: RPT.