ศรีศิริ สุนันทา, and มนัสมงคล สุนันทา. 2012. “Factors Associated With Happiness of Junior Secondary Students in Demonstration Secondary School, Srinakharinwirot University”. RMUTI Journal Humanities and Social Sciences 5 (2):59-71. https://so05.tci-thaijo.org/index.php/RMUTI_SS/article/view/189536.