Gunarto, Toto, Rialdi Azhar, Novita Tresiana, Supriyanto Supriyanto, and Ayi Ahadiat. 2020. “Accurate Estimated Model of Volatility Crude Oil Price”. International Journal of Energy Economics and Policy 10 (5):228-33. https://econjournals.com./index.php/ijeep/article/view/9513.