Watanasungsuti, Arnat, Chusak Pornsing, Taratat Kaolim, and Pannathorn Chiantharavanich. “DETERMINATION ON BUYING PRICE OF RAW MATERIAL RICE OF QUALITY IMPROVEMENT AND PACKAGING SAMPLE FACTORY”. Engineering and Applied Science Research 34, no. 2 (June 5, 2012): 163–175. accessed April 24, 2025. https://ph01.tci-thaijo.org/index.php/easr/article/view/1811.