Uji Aktivitas Antibakteri Sediaan Gel Ekstrak Daun Sereh (Cymbopogon nardus L. Rendle) terhadap Bakteri Staphylococcus aureus Penyebab Jerawat: Anti Bacterial Activity Test Of Extract Gel Formulation Of Lemongrass Leaves (Cymbopogon nardus L. Rendle) on Staphylococcus aureus Acne Causing Bacteria - Sarlina, Sarlina (Universitas Tadulako, 2017)