Noiarsa, Rakchanok, and Prasert Prasomruk. 2018. “Level of Happiness and Model of Enhancing Happiness in Working Of Health Personnels at Yasothon Provincial Public Health Office”. Srinagarind Medical Journal 33 (6):595-601. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/149336.