Siregar , M., M. S. Lubis, R. Yuniarti, and Z. Rani. “Formulation, Evaluation and Antioxidant Activity of Used Nano Tea Bags Solid Soap”. Journal of Pharmaceutical and Sciences, vol. 8, no. 4, Nov. 2025, pp. 2641-6, doi:10.36490/journal-jps.com.v8i4.1055.