‘Heavy Metals Contamination in Water, Soil and Plant Samples of Okomu National Park, Edo State, Nigeria’, AJBR, vol. 23, nr. 1, pp. 29–34, jan. 2020, Geraadpleegd: 15 juni 2026. [Online]. Beschikbaar op: https://www.ojshostng.com/index.php/ajbr/article/view/859