Pratiwi, Denia, et al. “The Combination of Turmeric (Curcuma Domestica) Rhizome Extract and Collagen in A Serum Formulation As an Antioxidant”. Borneo Journal of Pharmacy, vol. 4, no. 1, Feb. 2021, pp. 36-42, https://doi.org/10.33084/bjop.v4i1.1578.