Hanin Shohwati Muthi’ah, Ghaida Azzahra, Hana Rahmawati, and Nailah Husnayain. “Calculation of SPF Value and Root Analysis on Determining Vitamin C Levels in Sunscreens Using the Fishbone Diagram”. Solo International Collaboration and Publication of Social Sciences and Humanities, vol. 3, no. 02, Apr. 2025, pp. 237-46, doi:10.61455/sicopus.v3i02.253.