Anwar, Usman, Yosep Patadungan, and Isrun Isrun. “Perubahan Sifat Kimia Tanah Serta Pertumbuhan Sawi (Brassica Juncea) Akibat Pemberian Limbah Cair Pabrik Kelapa Sawit”. AGROTEKBIS : JURNAL ILMU PERTANIAN (e-journal) 7, no. 2 (April 30, 2019): 179 - 185. Accessed May 20, 2024. http://jurnal.faperta.untad.ac.id/index.php/agrotekbis/article/view/400.