Bibliography
- "The War Center" The Medievil Centre. 24 April, 2000. The centre for medievil technology. 17 Nov. 2000. Angle "open http://www.middelaldercentret.dk/english/us_home.htm".
- "The Xenophone Group" Non Gunpowder Artillery. 16 June 2000. Society de l'Orislamme. 17 Nov. 2000. Angle "open http://xenophongroup.com/montjoie/ngp_arty.htm".
- "Trebuchet Mechanics" By Donald R. Siano. Available at The Algorithmic Beauty of the Trebuchet.
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