Amornnimit, U., Sansuk, N. S., & Rangseeprom, T. (2022). The Study of Elderly Life Happiness. Rajamangala University of Technology Tawan-ok Social Science Journal, 11(1), 116–127. retrieved from https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/253827