1. http://www.conocophillips.com/newsroom/other_resources/energyanswers/gasoline.htm
2. http://www.eia.doe.gov/emeu/steo/pub/contents.html
3. http://omrpublic.iea.org
4. http://www.eco-usa.net/toxics/ethbenz.shtml
5. http://www.westernpetro.com/doc/GasolineMSDS.doc