Sukiyah, Emi, Vijaya Isnaniawardhani, Adjat Sudradjat, and Fery Erawan. “The Geologic Potentials of Riau Islands Province and Its Development Design”. Jurnal Perspektif Pembiayaan dan Pembangunan Daerah 5, no. 3 (March 4, 2018): 181 - 190. Accessed July 22, 2024. https://online-journal.unja.ac.id/JES/article/view/4554.