Vissoci, J. R. N., L. F. Vieira, L. P. de Oliveira, and J. L. L. Vieira. “Motivation and Moral Atributes in Sport”. Journal of Physical Education , Vol. 19, no. 2, Oct. 2008, pp. 173-82, https://periodicos.uem.br/ojs/index.php/RevEducFis/article/view/5524.