Mutakyahwa, M. K. D., J. R. Ikingura, and G. Y. S. Mtui. “Monitoring of Heavy Metal Loading into the Wetlands South of Lake Victoria Basin, Nothern Tanzania”. Tanzania Journal of Science, vol. 35, no. 1, July 2009, pp. 17-36, http://tjs.udsm.ac.tz/index.php/tjs/article/view/395.