Teerasantikul, P., and K. Laeheem. “The Causal Model of Students’ Decision to Drop-Out for Undergraduate Students: A Review”. Ph.D. In Social Sciences Journal, vol. 12, no. 2, Aug. 2022, pp. 298-09, https://so05.tci-thaijo.org/index.php/phdssj/article/view/249171.