“Non-Gunpowder Artillery.” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. 127–142, www.jstor.org/stable/10.3138/j.ctt2tv1qn.10. Accessed 24 Sept. 2020.
DeVries, K. (1992). Non-Gunpowder Artillery. In Medieval Military Technology (pp. 127-142). University of Toronto Press. Retrieved September 24, 2020, from http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.10
DeVries, Kelly. "Non-Gunpowder Artillery." In Medieval Military Technology, 127-42. University of Toronto Press, 1992. Accessed September 24, 2020. http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.10.
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