Ramírez, V., R. Padial, B. Torres, J. J. Chinchilla, C. Suárez, J. L. Chinchilla, S. González, and M. Cepero González. “The Effect of a ‘PBL’ Physical Activity Program Based Methodology on the Development of Values in Spanish Primary Education”. Journal of Human Sport and Exercise, vol. 12, no. 4, Dec. 2017, pp. 1310-27, doi:10.14198/jhse.2017.124.17.