Putri, M.K. and Dellima, B.R.E.M. 2024. Formulasi Sleeping Mask Gel Ekstrak Kulit Buah Kopi Beserta Penentuan Kadar Fenol Total, Kafein dan Aktivitas Antioksidannya: Formulation of Sleeping Mask Gel Coffee Peel Extract and Determination of Total Phenol Content, Caffeine Content and Antioxidant Activity. Jurnal Sains dan Kesehatan. 6, 5 (Oct. 2024), 708–718. DOI:https://doi.org/10.25026/jsk.v6i5.2399.