ป้องชารี ปิลันธนา. 2016. “The Development of Aging Union Activities : A Case Study of Nadoon Sub-District, Nadoon District, Mahasarakham Province”. Journal of Graduate MCU KhonKaen Campus 3 (1):68-77. https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/243153.