Comparison between High Performance Thin Layer Chromatography and High Performance Liquid Chromatography Methods for Determination of Rubraxanthone in the Stem Bark Extract of Garcinia cowa Roxb, Susanti, Meri, Ibrahim Sanusi, Harahap Yahdiana, and , Pharmacognosy Journal, November 2018, Volume 10, Issue 6s, p.s42-s47, (2018)