Phetrak, A., S. Sangkarak, S. Ampawong, S. Ittisupornrat, and D. Phihusut. “Kinetic Adsorption of Hazardous Methylene Blue from Aqueous Solution onto Iron-Impregnated Powdered Activated Carbon: DOI: 10.32526/Ennrj.17.4.2019.33”. Environment and Natural Resources Journal, vol. 17, no. 4, July 2019, pp. 78-86, https://ph02.tci-thaijo.org/index.php/ennrj/article/view/201155.