“Antioxidant Activity Test of Effervescent Granules Morinda Citrifolia L Leaf Extract With DPPH Free Radical Absorption Method”. Journal of Tropical Pharmacy and Chemistry , vol. 5, no. 4, Dec. 2021, pp. 365–368, https://doi.org/10.30872/j.trop.pharm.chem.v5i4.260.