Hill, D. R. (1984). A history of engineering in classical and medieval times. London: Croom Helm.
Παραπομπή Chicago StyleHill, Donald Routledge. A History of Engineering in Classical and Medieval Times. London: Croom Helm, 1984.
Παραπομπή MLAHill, Donald Routledge. A History of Engineering in Classical and Medieval Times. London: Croom Helm, 1984.
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