Ngorwe, E. N., H. Nyambaka, J. Murungi, and T. Ongera. 2014. “Effects of Physico-Chemical Properties on Uptake of Lead and Cadmium in Tobacco Grown in Medially Polluted Soils”. The International Journal of Science & Technoledge 2 (8). http://internationaljournalcorner.com/index.php/theijst/article/view/139088.