“[Part III: Introduction].” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. 171–173, www.jstor.org/stable/10.3138/j.ctt2tv1qn.12. Accessed 21 Sept. 2020.
DeVries, K. (1992). [Part III: Introduction]. In Medieval Military Technology (pp. 171-173). University of Toronto Press. Retrieved September 21, 2020, from http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.12
DeVries, Kelly. "[Part III: Introduction]." In Medieval Military Technology, 171-73. University of Toronto Press, 1992. Accessed September 21, 2020. http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.12.
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