Katili, John, and Kamal Kamal. 2019. “Laporan Sementara Mengenai Geologi Daerah Ombilin Pesisir Utara Danau Singkarak”. Journal of Mathematical and Fundamental Sciences 1 (1):5-23. https://journals.itb.ac.id/index.php/jmfs/article/view/9823.