Widtayasumpun, Sunee, Narongrit Sopha, and Rungson Singhalert. 2017. “A Model for Moral Improvement in Savings of Students in Nonthaburi Secondary Schools”. Chophayom Journal 28 (3):301-7. https://so01.tci-thaijo.org/index.php/ejChophayom/article/view/107299.