“Chemical Characterization of Coffee from Several Region of Indonesia (Cafein Value, PH and Total Acid)”. Journal of Tropical Food and Agroindustrial Technology 4, no. 02 (July 31, 2023): 61–68. Accessed November 10, 2026. https://jtfat.umsida.ac.id/index.php/jtfat/article/view/1625.