Amornnimit, U., Sansuk, N. S. and Rangseeprom, T. (2022) “The Study of Elderly Life Happiness”, Rajamangala University of Technology Tawan-ok Social Science Journal, 11(1), pp. 116–127. available at: https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/253827 (accessed: 30 September 2026).