Obadi, Saleh Mothana, and Matej Korecek. “The Crude Oil Price and Speculations: Investigation Using Granger Causality Test”. International Journal of Energy Economics and Policy 8, no. 3 (May 8, 2018): 275–282. Accessed December 23, 2024. https://mail.econjournals.com/index.php/ijeep/article/view/6333.