“Introduction.” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. ix-xii, www.jstor.org/stable/10.3138/j.ctt2tv1qn.4. Accessed 28 Sept. 2020.
DeVries, K. (1992). Introduction. In Medieval Military Technology (pp. Ix-Xii). University of Toronto Press. Retrieved September 28, 2020, from http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.4
DeVries, Kelly. "Introduction." In Medieval Military Technology, Ix-Xii. University of Toronto Press, 1992. Accessed September 28, 2020. http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.4.
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