Poophayang , Piangkae. “A STUDY OF SPIRITUAL AND RELIGIOUS PROCESSES IN STRENGTHENING THE IMMUNE SYSTEM OF THE ELDERLY”. Journal of MCU Nakhondhat 10, no. 7 (July 23, 2023): 90–96. accessed December 6, 2025. https://so03.tci-thaijo.org/index.php/JMND/article/view/270684.