Syers, S. (2022) “The Causal Factors of Strategic Competence for the Development of Small and Medium-Sized Businesses under the Coronavirus Disease 2019 (COVID-19)”, Journal of Business, Innovation and Sustainability (JBIS), 17(2). available at: https://so02.tci-thaijo.org/index.php/BECJournal/article/view/253194 (สืบค้น: 28 สิงหาคม 2026).