Koleleni, Yusuf A., and Othman O. Haji. 2014. “Determination of Concentration of Heavy Metals in Fish from Sea Port of Zanzibar by Energy Dispersive X-Ray Fluorescence (EDXRF)”. Tanzania Journal of Science 40 (1):70-79. https://tjs.udsm.ac.tz/index.php/tjs/article/view/373.