Yuwita, F., I. Ifmalinda, and M. Makky. “Prediction of Caffeine and Protein of Arabica Coffee Beans Using Near Infrared Spectroscopy (NIRS)”. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), vol. 12, no. 4, Dec. 2023, pp. 852-6, doi:10.23960/jtep-l.v12i4.852-862.