Ugwu Patience, U. P., I. S. Inyagha Stella, U. H. Udodeme Helen, and D. E. Diovu Edith. “Effect of Heavy Metals on the Features of Medicinal Plants at a Quarrying Site, in Ishi-Agu Ebonyi State Nigeria”. International Journal of Indigenous Herbs and Drugs, Apr. 2018, pp. 5-11, https://www.saapjournals.org/index.php/herbsanddrugs/article/view/69.