Asaolu, S. S., and O. Olaofe. 2005. “Biomagnification of Some Heavy and Essential Metals in Sediments, Fishes and Crayfish from Ondo State Coastal Region, Nigeria”. Biological Sciences - PJSIR 48 (2):96-102. https://v2.pjsir.org/index.php/biological-sciences/article/view/1344.