Bibliography

http://www.juliantrubin.com/bigten/davinciparachute.html

http://www.visual-arts-cork.com/famous-paintings/last-supper-leonardo-davinci.htm

http://www.leonardodavincisinventions.com/war-machines/leonardo-da-vincis-tank/

http://www.da-vinci-inventions.com/scuba-gear.aspx

http://www.da-vinci-inventions.com/triple-barrel-canon.aspx

http://www.da-vinci-inventions.com/giant-crossbow.aspx