Roohollah, Hamid, y Mahdi. «Index of Difficulty Which Is an Effective Factor on Especial Skill Formation in Basketball Free Throw: Index of Learning Difficulty Hypothesis». Revista Publicando 5, no. 16 (2) (octubre 9, 2018): 50-62. Accedido abril 28, 2024. https://revistapublicando.org/revista/index.php/crv/article/view/1647.