Widtayasumpun, Sunee, Narongrit Sopha, and Rungson Singhalert. “A Model for Moral Improvement in Savings of Students in Nonthaburi Secondary Schools”. Chophayom Journal 28, no. 3 (December 26, 2017): 301–307. Accessed May 1, 2024. https://so01.tci-thaijo.org/index.php/ejChophayom/article/view/107299.