Weapons, an International Encyclopedia from 5000 Bc to 2000 Ad. New York: St. Martin's Press, 1980. Print.
Macpherson, Stewart M.. "Military Battles & Uprisings, excerpts from "The Highlander Magazine"." The Highlander Magazine. N.p., n.d. Web. 3 Feb. 2011. http://www.artillery-museum.ru/files/Image/34_thumb(2).jpg
"Ordnance BL 15 pounder - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 4 Feb. 2011. <http://en.wikipedia.org/wiki/Ordnance
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjir17hYoMRVr42XISeSgNLXPZdtE-fGY6X4jF3zTc8bLSaRdm6ZSTIjjV6eW5IzSFNEsoYVZRy-mz1WhAw7IfuAkNu_OQSMIL4HJOz-IG65RYXbw-Nh88ASutMwh0u3vjQIJGWM3XFMsFf/s400/MonsMeg.JPG
http://upload.wikimedia.org/wikipedia/commons/d/df/BLC15pdrGunIWM.jpg
http://etc.usf.edu/clipart/19400/19404/chain-shot_19404_lg.gif
http://etc.usf.edu/clipart/70200/70226/70226_grapeshot_lg.gif
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/MaryRose-round_shot.JPG/800px-MaryRose-round_shot.JPG
http://wapedia.mobi/thumb/9ac5499/en/fixed/470/326/Shrapnel%2526BoxerShellDesigns.jpg?format=jpg
http://operatorchan.org/k/arch/src/k44411_German%20WW1%20Maxim%20QF%201%20pounder%20pom-pom%201903%20mounted.jpg
http://users.multipro.com/brentandloriann/PAK%2036%20B.jpg
http://farm2.static.flickr.com/1237/809535769_5513e811b8.jpg
http://farm1.static.flickr.com/192/476780376_c0d4b96ef9.jpg