Fitrianti, Wanti, Yusman Syaukat, Sri Hartoyo, and Anna Fariyanti. 2019. “The Spillover Effect of Shocks of Fundamental Factors and Speculative Activity on Prices Volatility of World Vegetable Oil”. International Journal of Economics and Financial Issues 9 (2):230-40. https://www.econjournals.com/index.php/ijefi/article/view/7621.