Pratiwi, Yani, et al. “Formulation and Evaluation of Red Betel Leaf (Piper Crocatum L) Ethanol Extract 96% in Anti-Acne Cream”. Jurnal Biologi Tropis, vol. 25, no. 3, Aug. 2025, pp. 4388-9, doi:10.29303/jbt.v25i3.9570.