ShaAto, Rufus, Eneji, Ishaq S., AND Annune, P. A.. "Bioaccumulation of Heavy Metals in Fish (Tilapia Zilli and Clarias Gariepinus) Organs from River Benue, North Central Nigeria" Pakistan Journal of Analytical & Environmental Chemistry [Online], Volume 12 Number 1 & 2 (1 December 2011)