"Atlatl - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 6 Feb. 2011. <http://en.wikipedia.org/wiki/Atlatl>.
Country. "Cannon - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 6 Feb. 2011. <http://en.wikipedia.org/wiki/Cannon>.
"Mark I tank - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 6 Feb. 2011. <http://en.wikipedia.org/wiki/Mark_I_tank#Mark_V_series>.
"Moorish Cannon." Shutter Stock. N.p., n.d. Web. 26 Jan. 2011. <image.shutterstock.com/display_pic_with_logo/6412/6412,1134598862,7/stock-photo-moorish-tower-and-cannon-in-puerto-banus-in-the-port-of-puerto-banus-in-spain-812152.jpg>.
"Titan (rocket family) - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 1 Feb. 2011. <http://en.wikipedia.org/wiki/Titan_(rocket_family)>.
