Martín Barrero, Alberto. “Efecto De Dos métodos De Entrenamiento Sobre La motivación En Porteros De Fútbol Formativo (Effect of Two Training Methodologies on Motivation in Goalkeepers in Youth Football)”. Retos 48 (March 31, 2023): 207–212. Accessed June 10, 2026. https://revistaretos.org/index.php/retos/article/view/96937.