อัตไพบูลย์ ภ. (2020). Economic Linkages among Border Provinces in the South of the Lower Northeastern Region. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University, 15(2), 125–137. Retrieved from https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/229701