Karakteristik dan Stabilitas Sediaan Gel Mulut Berbahan Aktif Ekstrak Daun Sirih Hitam Berbasis Hydroxy Ethyl Cellulose (HEC). J. Trop. Pharm. Chem. 2013;2(2):83-90. Accessed October 26, 2025. https://jtpc.ff.unmul.ac.id/index.php/jtpc/article/view/64