Sonde, C. U., S. A. Odoemelam, and F. K. Onwu. “Isotherm Studies of Equilibrium Sorption of Cu2+ and Cd2+ from Aqueous Solutions by Modified and Unmodified Breadfruit Seed Hull”. Orbital: The Electronic Journal of Chemistry, Vol. 7, no. 3, Sept. 2015, pp. 215-2, https://periodicos.ufms.br/index.php/orbital/article/view/17861.