The contribution of mental rigidity to the level of performance of the Premier League football referees. Journal of Physical Education, [S. l.], v. 30, n. 1, p. 335–356, 2018. DOI: 10.37359/JOPE.V30(1)2018.338. Disponível em: https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/338.. Acesso em: 27 apr. 2024.