Tanayut Chaitongrat, Surapong Liwthaisong, Preenithi Aksorn, Wuttipong Kusonkhum, and Narong Leungbootnak. 2021. “CAUSAL RELATIONSHIP MODEL OF PROBLEMS IN PUBLIC SECTOR PROCUREMENT”. GEOMATE Journal 20 (80):52-58. https://geomatejournal.com/geomate/article/view/298.