1. No Author.Gasoline and diesel fuel update. Available from:http://www.eia.gov/petroleum/gasdiesel/[accessed on June 1 2014].
2. WH Moore 2013
3. ThomasG.Overview of Storage Development DOE Hydrogen Program.US Department of Energy Hydrogen Program 2000 Annual Review San Ramon CA: 2000. Available from:http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/storage.pdf[accessed on May 8 2014].
4. Fuel cell electric vehicles and hydrogen infrastructure: status 2012
5. No Author.Union Gas Ltd. Chemical Composition of Natural Gas. Available from:https://www.uniongas.com/about‐us/about‐natural‐gas/Chemical‐Composition‐of‐Natural‐Gas/[accessed on: May 8 2014].