(1)
Girsang, L. C. .; Fachrial, E. .; Lister, I. N. E. . Effectiveness Test of Robusta Coffee (Coffea Cenephora) Extract from North Sumatra in Collagen and Hydration Skin Level of Female Wistar Rattus Norvegicus. ASRJETS-Journal 2020, 65, 108-115.