“UTILIZATION OF CHROME-TANNED LEATHER SHAVING AND BUFFING WASTE AS RAW MATERIALS FOR KEYCHAINS USING POLYURETHANE ADHESIVE”. Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit 25, no. 1 (June 30, 2026): 23–30. Accessed August 6, 2026. https://e-jurnal.politeknikatk.ac.id/index.php/bptkspk/article/view/138.