1. http://www.uh.edu/engines/epi1562.htm. Accessed 7/28/2007.
2. http://www.blurtit.com/q434300.html. Accessed 7/28/2007.
3. http://www.ausbcomp.com/∼bbott/cars/carhist.htm. Accessed 7/29/2007.
4. http://www.multiage-education.com/eled425/vtf/maureenvft.htm. Accessed 7/27/2007.
5. http://www.thehistoryof.net/the-history-of-automobiles.html. Accessed 8/1/2007.