Ukpe, Richard A., and Babatunde T. Ogunyemi. “Assessment of Heavy Metals in Selected Medicinal Plants in Bayelsa State, Nigeria”. Nigerian Journal of Pharmaceutical and Applied Science Research 13, no. 4 (May 31, 2025): 28–36. Accessed June 6, 2025. https://nijophasr.net/index.php/nijophasr/article/view/591.