”Heavy Metals Contamination in Water, Soil and Plant Samples of Okomu National Park, Edo State, Nigeria”, AJBR, vol. 23, nr 1, s. 29–34, jan. 2020, åtkomstdatum: 21 maj 2026. [Online]. Tillgänglig vid: https://www.ojshostng.com/index.php/ajbr/article/view/859