Aganigbo, C. I, and D. C Ozoko. “Graphic Interpretation and Assessment of Surface Water Quality Index in Ishiagu, Southeastern Nigeria”. International Research Journal of Applied Sciences, Engineering and Technology 6, no. 2 (February 23, 2020): 1–12. Accessed December 22, 2025. https://cirdjournals.com/index.php/irjaset/article/view/951.