Horsfall Jnr., Michael, Fred E. Ogban, and Eyetemi E. Akporhonor. 2006. “Recovery of Lead and Cadmium Ions from Metal-Loaded Biomass of Wild Cocoyam (Caladium Bicolor) Using Acidic, Basic and Neutral Eluent Solutions”. Electronic Journal of Biotechnology 9 (2). Valparaíso, Chile:0-0. https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v9n2-9.