halimah, S. et al. 2025. Optimization of Teak Leaf Extract (Tectona grandis L.F) and Carbopol in Hair Dye Formulation Using Factorial Design Method. JURNAL KESEHATAN, SAINS, DAN TEKNOLOGI (JAKASAKTI). 4, 2 (Aug. 2025), 342–355. DOI:https://doi.org/10.36002/js.v4i2.4283.