Siagian, Ari Haikal, Yanty Faradillah, and Fachrul Rozi. “Sistem Rekomendasi Oleh-Oleh Medan Dari UMKM Kota Medan Menggunakan Metode Collaborative Filtering”. Innovative: Journal Of Social Science Research 3, no. 5 (November 3, 2023): 7932–7941. Accessed May 20, 2026. https://j-innovative.org/index.php/Innovative/article/view/5807.