1. 1997, Thinkquest 10949 Team.
2.The Political Crusade by Nicolaa de Bracton of Leicester
3. The Book of Archery Medieval Warfare Discursive Bibliography Paul V. Walsh, 1997
4. NOVA Science Unit http://www.pbs.org/wgbh/nova/lostempires/trebuchet/ 2000
5. The Grey Company Trebuchet Page Russell Miners 2000. Last edited Feb 2000 http://members.iinet.net.au/~rmine/gctrebs.html
6. Medieval Welsh Warriors and Warfare http://www.castlewales.com/warfare.htmlDaniel Mersey, 1997
7. What draw weights were Medieval English war bows? Bob Unitt, http://www.student.utwente.nl/~sagi/artikel/usenet/draw.html Dec. 6, 1995
8.This site was created by a group of fourth grade students for the ThinkQuest Junior Contest. /J002390/?tqskip1=1&tqtime=0321 Copyright March, 2000