Purba, Jhon Kevin, Rama R Sitinjak, Nur Ariyani Agustina, and Julaili Irni. “Kepadatan Populasi Cacing Tanah Pada Perkebunan Kelapa Sawit Di Desa Salang Tungir Kecamatan Namorambe”. Jurnal Ilmiah Sains 22, no. 1 (August 2, 2022): 17–22. Accessed April 25, 2024. https://ejournal.unsrat.ac.id/v3/index.php/JIS/article/view/35703.