Widyasti, A.R. et al. 2017. THE DEVELOPMENT OF STANDARDIZATION NATURAL COLOUR FROM BATIK OF STEAM BARK (Caesalpinia sappan L) BY SPECTROSCOPHY METHOD. Jurnal Penelitian Saintek. 22, 1 (Aug. 2017), 49–58. DOI:https://doi.org/10.21831/jps.v22i1.14850.