1. Adisa, A. L., & Adekoya, J. A. (2016). Assessment of pollution by heavy metals in sediments of River Oyi and its tributaries, southwestern Nigeria: Ife Journal of Science, 18, 871–886.
2. Ajayi, S. O., & Osibanjo, O. (1981). Pollution studies in Nigerian Rivers. Water Quality of Some Nigerian Rivers: Environmental Pollution, 2, 87–95.
3. Akinmosin, A., Osinnowo, O. O., & Oladunjoye, M. A. (2009). Radiogenic Components of the Nigerian Tar Sand Deposits: Earth Science Resource Journal, 13, 64–73.
4. Akoto, O., Bruce, T. N., & Darko, G. (2008). Heavy Metals Pollution Profiles in Streams Serving the Owabi Reservoir: African Journal of Environmental Science Technology, 2, 354–359.
5. Aladesanmi, O. T., Agboola, F. K., & Adeniyi, I. F. (2016). Distribution of Heavy Metals in Surface Sediments from Streams and Their Associated Fishponds in Osun State Nigeria: Journal of Health and Pollution, 6, 34–46.