Tongkobsom N, Urairat Y, Prommai P. Operational Efficiency of Small and Medium Enterprises in Rubber Wood Business, Songkhla Province. ecbajournal [internet]. 2021 Jul. 28 [cited 2026 Sep. 13];13(2):101-22. available from: https://so01.tci-thaijo.org/index.php/ecbatsu/article/view/244797