Army, Widya Lelisa, Sri Anita, and Retno Ramadhina. “Hybrid CNN and KNN Approach for Coffee Bean Quality Identification”. Sinkron : jurnal dan penelitian teknik informatika 9, no. 4 (October 26, 2025): 3246-3256. Accessed May 19, 2026. https://jurnal.polgan.ac.id/index.php/sinkron/article/view/15366.