Chamnikul, S., and P. Kanmuansilpa. “The Perception of value and role of Sub-District Headman and Village Headman in Chumpae District, Khon Kaen Province”. Dhammathas Academic Journal, vol. 21, no. 3, Sept. 2021, pp. 89-100, https://so06.tci-thaijo.org/index.php/dhammathas/article/view/249989.