INDRAWATI, IDA, et al. “Antibacterial Activity of Ethanolic Extracts of Rhizome from Three Ginger Varieties Against Acne Isolated Bacteria”. Nusantara Bioscience, vol. 9, no. 1, Feb. 2017, pp. 92-96, https://doi.org/10.13057/nusbiosci/n090116.