Phytochemical Evaluation and Antioxidant Activity of Virginia tobacco Leaves (Nicotiana tabacum L. var virginia) Fractions with DPPH and FTC Methods, Yati, Kori, Gozan Misri,, Anggia Vivi, Prastiwi Rini, and Jufri Mahdi , Pharmacognosy Journal, June 2022, Volume 14, Issue 3, p.544-548, (2022)