“[Part I: Introduction].” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. 3–6, www.jstor.org/stable/10.3138/j.ctt2tv1qn.5. Accessed 24 Jan. 2021.
DeVries, K. (1992). [Part I: Introduction]. In Medieval Military Technology (pp. 3-6). University of Toronto Press. Retrieved January 24, 2021, from http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.5
DeVries, Kelly. "[Part I: Introduction]." In Medieval Military Technology, 3-6. University of Toronto Press, 1992. Accessed January 24, 2021. http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.5.
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