Howard, Ibigoni Clinton, and Briggs Amonia Olulu. “Metal Pollution Indices of Surface Sediment and Water from the Upper Reaches of Sombriero River, Niger Delta, Nigeria”. Our Nature 10, no. 1 (March 13, 2013): 206–216. Accessed December 12, 2024. https://nepjol.info/index.php/ON/article/view/7783.