Sittivongsa, Boonpeng, Pot Toopot, Sompong Suwannaphuma, Pongmetee Chaiseeha, Witoon Weerasin, and Songphon Choutikavatchagul. “Participation in Policy Formulation of Municipal Waste Disposal in Kumphawapi District, Udon Thani Province”. Academic Journal of Mahamakut Buddhist University Roi Et Campus 9, no. 2 (November 15, 2019): 424–434. Accessed February 8, 2023. https://so01.tci-thaijo.org/index.php/AJMBU/article/view/244714.