Obadi, Saleh Mothana, Sona Othmanová, and Mariam Abdová. “What Are the Causes of High Crude Oil Price? Causality Investigation”. International Journal of Energy Economics and Policy 3, no. S (September 9, 2013): 80–92. Accessed April 20, 2024. https://www.econjournals.com/index.php/ijeep/article/view/582.