นาควิบูลย์วงศ์ สุวรรณา. 2018. “A CAUSAL RELATIONSHIP MODEL OF LEARNING WITH HAPPINESS BASED ON EDUCATIONAL REFORM FOR STUDENTS OF SANTIRAT VOCATIONAL COLLEGE”. Sripatum Review of Humanities and Social Sciences 13 (1):112-21. https://so05.tci-thaijo.org/index.php/spurhs/article/view/117062.