Simanjuntak, Charles. “Keragaman Dan Struktur Kumpulan Ikan Di Anak Sungai-Anak Sungai Sopokomil, Dairi, Sumatera Utara [Fish Diversity and Assemblage Structure in Tributaries of Sopokomil River, Dairi, North Sumatra]”. Jurnal Iktiologi Indonesia 12, no. 2 (December 24, 2012): 155-172. Accessed April 23, 2026. https://jurnal-iktiologi.org/index.php/jii/article/view/121.