“UTILIZATION OF AROMATIC SULPHONES IN THE UPPER SHOES LEATHER TANNING PROCESS”. Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit 22, no. 2 (December 16, 2024): 52–59. Accessed April 4, 2025. https://e-jurnal.atk.ac.id/index.php/bptkspk/article/view/18.