M. K. Putri, S. A’isyah Shafira, and B. Ria Erika Marita Dellima, “Variation of HPMC Concentration on The Stability of The Physical Properties of Peel Off Gel Coffee Arabica (Coffea arabica) Peel: Variasi Konsentrasi HPMC Terhadap Stabilitas Sifat Fisik Masker Gel Peel Off  Kulit Buah Kopi Arabika (Coffea arabica)”, J Riseta Naturafarm, vol. 3, no. 1, pp. 19–29, Mar. 2026, doi: 10.70392/jrn.v3i1.1929.