Husni, Elidahanum, et al. “Characterization of Crude Drugs and Henna Leaves Extract (Lawsonia Inermis Linn) and Determination of Total Phenolic Content and Antioxidant Activity Test”. Jurnal Sains Farmasi & Klinis, vol. 5, no. 1, Apr. 2018, pp. 12-16, doi:10.25077/jsfk.5.1.12-16.2018.