Bibliography

Information

http://en.wikipedia.org/wiki/History_of_American_football

http://www.faqs.org/sports-science/Fo-Ha/Football-Field-Goal-Physics.html

http://entertainment.howstuffworks.com/physics-of-football.htm

 

pictures

http://www.clipartof.com/details/clipart/70680.html

http://www.free-extras.com/tags/1/football.htm

http://www.tusculum.edu/athletics/football/teampic.html

http://www.picturesof.net/pages/090818-003266-257054.html

http://www.fotosearch.com/IMZ004/pgi0284/

http://www.asc-csa.gc.ca/eng/educators/resources/mars/background_launch.asp

http://blog.pauliewood.com/

http://www.gettyimages.com/detail/81419096/Sports-Illustrated

http://forum.nfluk.com/showthread.php?t=55841