1. www.eere.energy.gov/vehiclesandfuels/facts/2003/fcvt_fotw259.shtml.
2. www.fhwa.dot.gov/ohim/hs98/tables/dllc.pdf.
3. http://nhts.ornl.gov/2001/pub/STT.pdf www.cdc.gov/mmwr/preview/mmwrhtml/mm4828a1.htm.
4. www-nrd.nhtsa.dot.gov/pdf/nrd-30/NCSA/TSF2003/809769.pdf.