Palapa, N. R., N. Normah, T. Taher, R. . Mohadi, A. Rachmat, and A. Lesbani. “Effectivity of Indonesian Rice Husk As an Adsorbent for Removing Congo Red from Aqueous Solutions: 10.32526/Ennrj/19/2020232”. Environment and Natural Resources Journal, vol. 19, no. 4, June 2021, pp. 225-6, https://ph02.tci-thaijo.org/index.php/ennrj/article/view/242020.