Alfiany, F.; Putri, N. E. K.; Prasetya, F. Optimasi Basis Formulasi Sediaan Handsanitizer Gel Ekstrak Daun Sirih Hitam (Piper Betle Var Nigra) Sebagai Antibakteri: Optimization of the Hand Sanitizer Gel Preparation Base for Black Betel Leaf Extract (Piper Betle Var Nigra) As an Antibacterial. Proc. Mul. Pharm. Conf. 2021, 14, 186-189.