Essien, Enobong R., et al. “Characterisation of ZnO Nanoparticles Prepared Using Aqueous Leaf Extracts of Chromolaena Odorata (L.) and Manihot Esculenta (Crantz)”. South African Journal of Science, vol. 118, no. 1/2, Jan. 2022, doi:10.17159/sajs.2022/11225.