Suwarno, Suwarno. “PEMANFAATAN STEEL SLAG INDONESIA DI BIDANG PERTANIAN”. Jurnal Ilmu Tanah dan Lingkungan 12, no. 1 (April 1, 2010): 36-41. Accessed May 22, 2024. https://jai.ipb.ac.id/index.php/jtanah/article/view/16595.