1. Office of the Chief Economist (International Energy Agency)
2. Energy Information Administration http://go.nature.com/mqkmwx
3. Natural gas: The fracking fallacy;Inman;Nature,2014
4. Snow N http://www.ogj.com/articles/2014/06/lng-exports-dominate-senate-committee-hearing-on-us-gas-potential.html
5. Federal Energy Regulatory Commission http://www.ferc.gov/industries/gas/indus-act/lng.asp