Istiharoh, R., Wahida Hajrin, and Nisa Isnaeni Hanifa. “Formula Optimization and Evaluation of Soap Gel Preparations of Hibiscus Leaf Ethanol Extract”. Jurnal Kedokteran, vol. 11, no. 3, Nov. 2022, pp. 1073-8, doi:10.29303/jku.v11i3.752.