1. As world ‘s population booms, will its resources be enough for us?;Dimick,2014
2. Advancing systems and technologies to produce cleaner fuels technology assessments: unconventional oil and gas [Internet];US Department of Energy,2015
3. U.S. energy consumption rose slightly in 2016 despite a significant decline in coal use [Internet];Mobilia,2017
4. Monthly energy review, April 2017 [Internet];U.S. Energy Information Administration,2017