Mahugija, J. A., and H. M. Sheikh. “Status of Selected Heavy Metals Dispersion from Top Soil in and Around Automobile Workshop Areas in Zanzibar Municipality, Tanzania”. Tanzania Journal of Science, vol. 44, no. 1, May 2021, pp. 12-23, http://tjs.udsm.ac.tz/index.php/tjs/article/view/675.