Suarantika, F., & Akbar, N. H. (2022). Validation of Analytical Methods of Several Secondary Metabolic Compounds in Andrographis paniculata, Zingiber officinale var. rubrum, and Nigella sativa as COVID-19 Therapy: A Review. Jurnal Ilmiah Medicamento, 8(1), 69–79. https://doi.org/10.36733/medicamento.v8i1.3355