Chairgulprasert, V., N. Madlah, R. Pohmueyae, and N. Madmanang. “Removal of lead(II) ion in water by adsorbents from Pithecellobium dulce”. KKU Science Journal, vol. 44, no. 1, Mar. 2016, pp. 189-00, https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/249488.