Pitchaon Maisuthisakul, and Suphan Charuchongkolwongse. 2007. “Effect of Cratoxylum formosum Extract and Stripping on Soybean Oil Stability”. Agriculture and Natural Resources 41 (5). Bangkok, Thailand:350-56. https://li01.tci-thaijo.org/index.php/anres/article/view/244392.