Quintanilla Bautista, E., et al. “Inluence of Diferent Aquatic Materials on the Perceived Competence in the Aquatic Environment by Students in the Second Cycle of Early Childhood Education”. SPORT TK-EuroAmerican Journal of Sport Sciences, vol. 7, no. 2, Sept. 2018, pp. 73-80, doi:10.6018/sportk.342941.