Erhenhi , O. H, and O. M Omoigberale. “USING WATER QUALITY INDEX AND PRINCIPAL COMPONENT ANALYSIS FOR THE ASSESSMENT OF WATER QUALITY OF THE ETHIOPE RIVER, DELTA STATE, NIGERIA”. NIGERIAN JOURNAL OF SCIENCE AND ENVIRONMENT 18, no. 1 (June 23, 2022). Accessed April 24, 2024. https://delsunjse.com/index.php/njse/article/view/60.