M. Grimaldi-Puyana, P. Gálvez-Ruiz, A. J. Sánchez-Oliver, and V. Alcaraz-Rodríguez, “Situation of the indebtedness of the organizations of sports facilities management of non-competitive leisure. An empirical study”, sportk, vol. 7, no. 2, pp. 41–48, Sep. 2018.