Pipiddhanawadee Somkhane, Kwanjira Sukree, Kamollapat Chaisongkram, Sanya Kenaphoom. “Public Attitudes Towards the Administration of Local Administrative Leaders Kok Tum Municipality Dong Luang District, Mukdahan Province”. Design Engineering, Nov. 2021, pp. 10598 -04, http://thedesignengineering.com/index.php/DE/article/view/6117.