Andry, M., F. Shufyani, M. A. Nasution, M. F. Fadillah, I. J. Tambunan, and F. Rezaldi. “Phytochemical Screening and Analysis of Caffeine Content in Arabica Ground Coffee in Takengon City Using Spectrophotometry Ultraviolet”. Journal of Pharmaceutical and Sciences, vol. 6, no. 3, July 2023, pp. 998-1006, doi:10.36490/journal-jps.com.v6i3.176.