In vitro Cytotoxicity of Hibiscus sabdariffa Linn Extracts on A549 Lung Cancer Cell Line, Fithrotunnisa, Qotrunnada, Arsianti Ade, Kurniawan Gerry, Qorina Fona, Tejaputri Nadzila Anindya, and Azizah Norma Nur , Pharmacognosy Journal, February  2020, Volume 12, Issue 1, p.14-19, (2020)