Gurning, S.; Agus, D.; Anwar, J. Legal Protection Against Default in Informal Industrial Waste Sales Transactions: Perlindungan Hukum Terhadap Wanprestasi Dalam Transaksi Penjualan Limbah Industri Nonformal. acopen 2026, 11, 10.21070/acopen.11.2026.14807.