Pinheiro Fernandes, Valter, et al. “El Fair Play En La iniciación Deportiva, Un Estudio Con Entrenadores De Fútbol (Fair Play in Sport Initiation, a Study of Football Coaches)”. Retos, vol. 25, Jan. 2014, pp. 32-35, https://doi.org/10.47197/retos.v0i25.34471.