Widyastuti, Zilpa, and Suci Widhiati. “Ceramide Is More Effective Than Shea Butter in Maintaining Skin Acidity”. Berkala Ilmu Kesehatan Kulit dan Kelamin 34, no. 1 (March 30, 2022): 5–9. Accessed July 13, 2024. https://e-journal.unair.ac.id/BIKK/article/view/31022.