References for mechanical engineering

www.nrel.gov/international/china/pdfs/annex5/ introduction_of_hybrid_electric_vehicles.pdf
http://www.howstuffworks.com/hybrid-car1.htm
http://www.howstuffworks.com/hybrid-car2.htm
http://www.ott.doe.gov/pdfs/drivehev_factsheet.pdf
http://www.ott.doe.gov/pdfs/puthev_factsheet.pdf
http://www.fueleconomy.gov/feg/hybridtech.shtml
http://www.ott.doe.gov/hev/what.html
http://www.ott.doe.gov/hev/components.html
http://www.ott.doe.gov/hev/related.html
http://www.fleets.doe.gov/fleet_tool.cgi?$$,benefits,1
http://www.ott.doe.gov/hev/faqs.html
http://www.ott.doe.gov/pdfs/techhev_factsheet.pdf
http://www.ott.doe.gov/pdfs/gmhev_factsheet.pdf
http://www.fueleconomy.gov/feg/hybrid_sbs.shtml