“Stone Castles.” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. 213–249, www.jstor.org/stable/10.3138/j.ctt2tv1qn.15. Accessed 28 Sept. 2020.
DeVries, K. (1992). Stone Castles. In Medieval Military Technology (pp. 213-249). University of Toronto Press. Retrieved September 28, 2020, from http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.15
DeVries, Kelly. "Stone Castles." In Medieval Military Technology, 213-49. University of Toronto Press, 1992. Accessed September 28, 2020. http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.15.
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