Srisang, A., and K. Komvuschara. “Energy saving as the application of cleaner technology: A case study of one of the Thai SME’s in chemical segment”. Engineering and Applied Science Research, vol. 32, no. 2, Nov. 2015, pp. 147-53, https://ph01.tci-thaijo.org/index.php/easr/article/view/42306.