Fahmi, Aliyah, et al. “The Inhibitory Activity Test of Green Tea Ethanol Extract (Camellia Sinensis) Sidamanik Against Escherichia Coli”. Science Midwifery, vol. 10, no. 2, Mar. 2022, pp. 705-8, https://www.midwifery.iocspublisher.org/index.php/midwifery/article/view/304.