Amornnimit, Uraiwan, Natsinee Sansuk Sansuk, and Thanoosak Rangseeprom. “The Study of Elderly Life Happiness”. Rajamangala University of Technology Tawan-ok Social Science Journal 11, no. 1 (June 29, 2022): 116–127. Accessed April 28, 2024. https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/253827.