Siregar, Yustika Fadilah, Basuki Wasis, and Iwan Hilwan. “Potensi Cadangan Karbon Hutan Nabundong KPH Wilayah VI Sumatera Utara”. Jurnal Ilmu Pertanian Indonesia 23, no. 1 (April 24, 2018): 67-73. Accessed May 29, 2022. https://jurnal.ipb.ac.id/index.php/JIPI/article/view/21163.