Yustica, Farah Khilma, Nur Intan Widiastuti, Nava Sapitri, and Dhina Fitriastuti. 2019. “Essential Oils from Alpinia Purpurata (Zingiberaceae): Chemical Composition and Formulation of Antiacne Cream”. INDONESIAN JOURNAL OF CHEMICAL RESEARCH 4 (1):14-21. https://doi.org/10.20885/ijcr.vol4.iss1.art3.