SITUNGKIR, D. .; JAMILAH; MARBUN, P. Pendugaan tingkat bahaya erosi pada hutan dan lahan Kopi Arabika (Coffea arabica) di Kecamatan Sibolangit. Jurnal Online Pertanian Tropik, [S. l.], v. 5, n. 1, p. 30–35, 2018. DOI: 10.32734/jopt.v5i1.3131. Disponível em: https://idjpcr.usu.ac.id/jpt/article/view/3131. Acesso em: 4 aug. 2025.