อินทรแสน ว., บุญคุ้ม ว. and เขียววิชัย ค. (2021) “A STUDY OF THE CURRENT SITUATION OF HAPPINESS IN ELDERLY IN THAILAND 4.0 PERIOD IN THE CENTRAL PROVICES OF THAILAND”, Srinakharinwirot Research and Development Journal of Humanities and Social Sciences. Bangkok, Thailand, 12(24, July-December), pp. 78–90. available at: https://so04.tci-thaijo.org/index.php/swurd/article/view/252878 (accessed: 29 August 2026).