Sayjumpa, J., B. Jomhataikool, K. Faungnawakij, S. Kuboon, W. Kraithong, M. Fuji, and A. Eiad-ua*. “Porous Carbon Adsorbent from Humin Derived from Thai Leonardite for Methylene Blue Dye Adsorption”. CURRENT APPLIED SCIENCE AND TECHNOLOGY, vol. 19, no. 1, Feb. 2019, pp. 1-8, https://li01.tci-thaijo.org/index.php/cast/article/view/123710.