“Preparation and Characterization of Betel Leaves (Piper betle Linn) Extract Nanoparticle with Ionic Gelation Method”, J. Trop. Pharm. Chem, vol. 5, no. 1, pp. 15–20, Jun. 2020, doi: 10.30872/j.trop.pharm.chem.v5i1.98.