Y. Hariningsih, S. Ma’arif, S. Nurhayati, and J. Khoiriyyah, “Formulation and Antioxidant Testing of Gold Nanoparticles Serum from Arabica Coffee Husk Extract (Coffea arabica L.) as an Anti-Aging Agent”, medfarm, vol. 15, no. 1, pp. 282-295, Jun. 2026.