Egas Romo, S. R., and E. R. Frómeta. “Sports Selection Norm for Ecuadorian Judo Initiation in Ages Between 8-11 Years”. Lecturas: Educación Física Y Deportes, Vol. 23, no. 242, June 2018, pp. 81-94, https://efdeportes.com/efdeportes/index.php/EFDeportes/article/view/558.