Sujono, H., Rizal, S., Purbaya, S., & Jasmansyah, J. (2019). Antibacterial Activity of the Essential Oil from Betel leaf (Piper betle L.) against Streptococcus pyogenes and Staphylococcus aureus. Jurnal Kartika Kimia, 2(1), 30-36. https://doi.org/10.26874/jkk.v2i1.27