Rattanapian, P., J. Tingsabhat, and V. Kanungsukkasem. “Factors influencing achievement of Regional League Division 2 football tournament management”. Kasetsart Journal of Social Sciences, vol. 39, no. 3, Sept. 2017, pp. 542-9, https://so04.tci-thaijo.org/index.php/kjss/article/view/242581.