“Early Medieval Fortifications.” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. 174–201, www.jstor.org/stable/10.3138/j.ctt2tv1qn.13. Accessed 21 Sept. 2020.
DeVries, K. (1992). Early Medieval Fortifications. In Medieval Military Technology (pp. 174-201). University of Toronto Press. Retrieved September 21, 2020, from http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.13
DeVries, Kelly. "Early Medieval Fortifications." In Medieval Military Technology, 174-201. University of Toronto Press, 1992. Accessed September 21, 2020. http://www.jstor.org/stable/10.3138/j.ctt2tv1qn.13.
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