Martín Espinosa, D.; González González de Mesa, C.; Zagalaz Sánchez, M. L.; Chinchilla Mira, J. J. Extracurricular Physical Activities: Motivational Climate, Sportspersonship, Disposition and Context. A Study With Primary 6th Grade Students. J. Hum. Sport Exerc. 2018, 13, 466-486.