Ngampiriyakorn G, Thammawiwat N, Kwalamthan W. The Development of Element’s Happiness in Ongkharak Demonstration School, Srinakharinwirot University. IARJ [Internet]. 2022 Sep. 29 [cited 2024 May 4];2(5):461-80. Available from: https://so03.tci-thaijo.org/index.php/IARJ/article/view/263659