Polwut, W., and V. U-on. “Development Model of The Buyer-Supplier Relationship Quality for Small and Medium Enterprises Gems and Jewelry Industry Sector in Thailand”. Ph.D. In Social Sciences Journal, vol. 8, no. 3, Dec. 2018, pp. 159-70, https://so05.tci-thaijo.org/index.php/phdssj/article/view/137233.