Okoro, H.K., A.O. Ikumapayi, and I.O. Folorunsho. 2015. “Seasonal Variation and Determination of Some Heavy Metals in the Sediment from Ureje River in Ado-Ekiti, Nigeria”. Al-Hikmah Journal of Pure and Applied Sciences (AJPAS) 2 (1): 14-19. https://alhikmahuniversity.edu.ng/AJPAS/index.php/journal/article/view/129.