Alsharif, Mohammad. “The Relationship Between the Returns and Volatility of Stock and Oil Markets in the Last Two Decades: Evidence from Saudi Arabia”. International Journal of Economics and Financial Issues 10, no. 4 (July 11, 2020): 1–8. Accessed May 23, 2022. https://www.econjournals.com/index.php/ijefi/article/view/9869.