Ogbiko, C., Okoh, E.V.C., and Abubakar, H. “Phytochemical Screening, In Vitro Antioxidant Activity and Polyphenolic Content of the Leaves of Nigerian Ziziphus Spina – Christi (L.) Willd”. International Journal of Science for Global Sustainability 6, no. 4 (January 24, 2021): 10. Accessed September 20, 2026. http://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/62.