1. Apache Corporation Discovers Significant New Resource Play in Southern Delaware Basin, 7 September 2016;Apache,2016
2. North America Rotary Rig Count, September 2016;Baker Hughes,2016
3. Break-Even Points for US Shale Oil, 17 October 2014;Bloomberg,2014
4. Big Oil Gobbles Up Record Debt as Borrowing Costs Decline, May 13, 2016;Bloomberg,2016