Ololade, I. A., L. Lajide, and I. A. Amoo. 2007. “Enrichment of Heavy Metals in Sediments As Pollution Indicators of the Aquatic Ecosystem”. Biological Sciences - PJSIR 50 (1):27-35. https://v2.pjsir.org/index.php/biological-sciences/article/view/732.