Puchongkawarin, C., S. . Mattaraj, and C. Umpuch. “Experimental and modeling studies of methylene blue adsorption onto Na-Bentonite clay”. Engineering and Applied Science Research, vol. 48, no. 3, May 2021, pp. 268-79, https://ph01.tci-thaijo.org/index.php/easr/article/view/240502.