Patcharachotsuthi, P. (2022) “The Modern Service Strategies to Create a Competitive Advantage of Travel Agents in the Mekong Provinces in the Northeastern Region”, Journal of Business, Innovation and Sustainability (JBIS), 17(1). available at: https://so02.tci-thaijo.org/index.php/BECJournal/article/view/244695 (สืบค้น: 28 สิงหาคม 2026).