Purified Anthocyanin from in vitro Culture of Bridelia retusa (L.) Spreng. Capable of Inhibiting the Growth of Human Oral Squamous Cell Carcinoma Cells, Madanakumar, Aswathy Jayasree, Lawarence Bosco, GS Manoj, and Kumaraswamy Murugan , Pharmacognosy Journal, March 2018, Volume 10, Issue 3, p.559-566, (2018)