Simaremare, Elisabet Rosevenny, Hesti Wahyuningsih, and T Alief Aththorick. “Analysis of Coral Reef Cover in Nias Regency, North Sumatra”. Tunas Geografi 13, no. 2 (April 30, 2025): 39–48. Accessed September 7, 2025. https://jurnal.unimed.ac.id/2012/index.php/tgeo/article/view/59317.