สุชิน กันย์ธนัญ, จันท์พิพัฒน์พงศ์ ธนพัทธ์, and เมืองใจ ทิพวรรณ. “A STUDY AND DEVELOPMENT OF ENHANCING A MODEL FOR HAPPINESS BY USING THE FACTORS AFFECTING THE HAPPINESS OF THE ELDERLY OF CHIANG KHONG DISTRICT, CHIANG RAI PROVINCE”. Research Community and Social Development Journal 14, no. 3 (July 1, 2020): 58–71. accessed October 8, 2026. https://so04.tci-thaijo.org/index.php/NRRU/article/view/240661.