Pambudi, D. B., N. N. Fajriyah, and V. R. Shalekhah. “Test on the Antioxidant Activities of Methanol Extract of Bidara Leaves (Ziziphus Spina-Christi L.) Using the DPPH Radical Immersion Method”. Borneo Journal of Pharmacy, vol. 3, no. 1, Feb. 2020, pp. 44-51, doi:10.33084/bjop.v3i1.1242.