จงจันทร์ ยุทธณรงค์, and คุปตัษเฐียร ณฐา. “ Ltd”. Frontiers in Engineering Innovation Research 2 (December 30, 2010): 17–27. accessed February 7, 2025. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242163.