Wornwattana, P. . “Factors Contributing to Delayed and Specified Graduation of Graduate Students of Faculty of Humanities and Social Sciences, Mahasarakham University”. Academic MCU Buriram Journal, vol. 5, no. 2, Dec. 2020, pp. 50-64, https://so06.tci-thaijo.org/index.php/ambj/article/view/243568.