Hasibuan, P. A. Z., and D. Fachrunisa. “Cell Cycle Inhibition and Apoptotic Induction of Vernonia Amygdalina Del. Leaves Extract on MCF-7 Cell Line”. Open Access Macedonian Journal of Medical Sciences, vol. 7, no. 22, Nov. 2019, pp. 3807-10, doi:10.3889/oamjms.2019.509.