Ruiz Vanoye JA, Díaz-Parra O, Fuentes-Penna A, Vélez-Díaz D, García Munguía M, Ruiz-Díaz J, Ruiz-Díaz F. Motivation Index to Improve the Soccer Performance. Int. Journal of COP and Infor. [Internet]. 2018 Jan. 9 [cited 2024 Dec. 30];8(3):45-57. Available from: https://ijcopi.org/ojs/article/view/18