1. State of the Union Address;Bush,2006
2. US Congress. Energy Policy Act of 2005. Available from:www.epa.gov/OUST/fedlaws/publ_109-058.pdf.p. 109–58.
3. State of the Union Address;Bush,2007
4. Assembly Bill 2076 (Pavley), Chapter 936, California Statutes of 2000.
5. Reducing California's petroleum dependence,2003