Tippunya, Sukserm, Civilaiz Wanaratwichit, and Wutthichai Jariya. 2018. “Effectiveness of Implementing a Happiness Program among Chronic Disease Patients with Depressive Disorder”. Academic Psychiatry and Psychology Journal 34 (2):119-35. https://he01.tci-thaijo.org/index.php/APPJ/article/view/81230.