Firearms and fortifications: Military architecture and siege warfare in Sixteenth Century Siena. University of Chicago Press, 1986. (With Nicholas Adams) ISBN0226655342
"Sword and spade: Military construction in renaissance Italy", in Construction History, 16, 2000. pp. 13–22. ISSN 0267-7768
Books, buildings and social engineering: Early public libraries in Britain from past to present. Ashgate, 2009. (With Alistair Black and Kaye Bagshaw) ISBN978-0415186049
"Warfare and Operational Art: Communications, Cannon and Small War" in Tallett, Frank and Trim, David, eds. European Warfare 1350-1750. Cambridge University Press, Cambridge, 2010. pp. 181–202.