Utami, Rany, Eka Intan Kumala Putri, and Meti Ekayani. “BIAYA EKSTERNAL DAN INTERNALISASI LIMBAH PABRIK KELAPA SAWIT”. Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) 8, no. 2 (August 1, 2018): 143-150. Accessed June 26, 2022. https://jma.journal.ipb.ac.id/index.php/jpsl/article/view/16202.