Shilla, Daniel A, and Shovi F Sawe. “Levels of Selected Toxic and Essential Elements in Fish and Oysters from Western Indian Ocean, Coast of Tanzania”. Tanzania Journal of Science 47, no. 2 (May 27, 2021): 718–727. Accessed October 22, 2021. http://tjs.udsm.ac.tz/index.php/tjs/article/view/687.