Hutabarat, Leonard Felix. “Diplomacy of Indonesia’s Natuna National Geopark Toward a UNESCO Global Geopark”. Masyarakat, Kebudayaan dan Politik 36, no. 4 (November 29, 2023): 517–528. Accessed August 2, 2024. https://e-journal.unair.ac.id/MKP/article/view/42498.