1. Understanding Today’s Natural Gas Business;Shively,2011
2. MIT Energy Initiative, the Future of Natural Gashttp://energy.mit.edu/research/future-natural-gas/
3. Uses of Natural Gashttps://www.ucsusa.org/clean-energy/coal-and-other-fossil-fuels/uses-of-natural-gas#.W_w9H_ZuJPY
4. Gas: The Righ Choice for Heating in Europehttps://eurogas.org/uploads/media/Gas__the_right_choice_for_heating_in_Europe_PART_II_Brochure_140814.pdf
5. The LNG Industry, GIIGNL Annual Reporthttps://giignl.org/sites/default/files/PUBLIC_AREA/About_LNG/5_LNG_Markets_And_Trade/giignl_2018_annual_report.pdf