Shell takes $22bn hit over low oil prices - BBC News
Too Much Oil: How a Barrel Came to Be Worth Less Than Nothing - The New York Times
Oil breaches $120 a barrel as petrol and diesel prices soar | Financial Times
Chart: Oil Price Surges to Highest since 2008 | Statista
Sustainability | Free Full-Text | An Auxiliary Index for Reducing Brent Crude Investment Risk—Evaluating the Price Relationships between Brent Crude and Commodities