Anticancer Activity of Ruellia britoniana Flower on Cervical HeLa Cancer Cells, Tejaputri, Nadzila Anindya, Arsianti Ade, Qorina Fona, Fithrotunnisa Qotrunnada, Azizah Norma Nur, and Putrianingsih Rista , Pharmacognosy Journal, February  2020, Volume 12, Issue 1, p.29-34, (2020)