Nnanga Nga, Emmanuel, et al. “Phytochemical Screening and Evaluation of Antioxidant Power of Hydro-Ethanolic and Aqueous Leaves Extracts of Annona Muricata Linn (Soursop)”. HEALTH SCIENCES AND DISEASE, vol. 20, no. 1, Dec. 2018, doi:10.5281/hsd.v20i1.1328.