Amornnimit, Uraiwan, Natsinee Sansuk Sansuk, and Thanoosak Rangseeprom. 2022. “The Study of Elderly Life Happiness”. Rajamangala University of Technology Tawan-Ok Social Science Journal 11 (1):116-27. https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/253827.