N. N. Y. Mendra, N. M. Puspayanti, N. P. U. Antari, I. G. M. Suradnyana, and I. W. S. Rahadi, “Formulation and Antioxidant Activity Test of Michelia champaca Linn. Flower Methanol Extract Gel Using DPPH (2,2-Diphenyl-1-Picrylhydrazyl) Method”, MFI, vol. 18, no. 2, pp. 87-100, Sep. 2023.