Faridah, A. et al. 2015. Simple Characterization of Betalain Compound from RED Pitaya (Hylocereus Polyrhizus) Peel Solution. International Journal on Advanced Science, Engineering and Information Technology. 5, 3 (Jun. 2015), 207–211. DOI:https://doi.org/10.18517/ijaseit.5.3.517.