Sookcharoen, W. “Market-Share Changing and Pricing Simulations of Thai Herbal Soap Using 3D-Perceptual Map”. KKBS Journal of Business Administration and Accountancy, vol. 4, no. 2, Aug. 2020, pp. 141-62, https://so04.tci-thaijo.org/index.php/kkbsjournal/article/view/241992.