LUMBANTOBING, AGAPE, I MADE SUDARMA, & WIDHIANTHINI WIDHIANTHINI. " Potensi Pengembangan Komoditas Perkebunan di Kabupaten Tapanuli Utara, Sumatera Utara." Jurnal Agribisnis dan Agrowisata (Journal of Agribusiness and Agritourism) [Online], (2020): 239-248. Web. 8 Jul. 2024