Peter, O. I., O. J. Adeyinka, and R. A. Akolade. “Application of Snail Shell Chitosan As a Bioadsorbent in Removal of Copper (II) Ions from Wastewater”. Earthline Journal of Chemical Sciences, Vol. 2, no. 1, July 2019, pp. 141-5, doi:10.34198/ejcs.2119.141151.