Mardhiyah, Resty Pevita, Linda Advinda and Mades Fifendy 2022. Antimicrobial Test of Betel Leaf Extract Formulation (Piper betle L.) with Yam Bean (Pachyrhizus erosus L.) to Staphylococcus aureus Bacteria of Acne Caused. Prosiding Seminar Nasional Biologi. 1, 2 (May 2022), 1420–1426. DOI:https://doi.org/10.24036/prosemnasbio/vol1/259.