“Karakteristik Dan Stabilitas Sediaan Gel Mulut Berbahan Aktif Ekstrak Daun Sirih Hitam Berbasis Hydroxy Ethyl Cellulose (HEC)”. 2013. Journal of Tropical Pharmacy and Chemistry 2 (2): 83-90. https://jtpc.ff.unmul.ac.id/index.php/jtpc/article/view/64.