Sayapunt, Udom, and Pimpa Hirankitti. “The Competitiveness of Small and Medium Enterprises in Metropolitan and Surrounding Areas”. University of the Thai Chamber of Commerce Journal Humanities and Social Sciences 34, no. 2 (May 1, 2014): 18–30. accessed August 30, 2026. https://so06.tci-thaijo.org/index.php/utccjournalhs/article/view/188805.