Catapults, Trebuchets, etc.

Bachrach, Bernard S. "Medieval Siege Warfare: A Reconnaissance." The Journal of Military History 58, no. 1 (1994): 119-133. Bachrach-Medieval_Siege_Warfare.pdf

Chevedden, Paul E. "The Invention of the Counterweight Trebuchet: A Study in Cultural Diffusion." Dumbarton Oaks Papers 54 (2000): 71-116. Chevedden-InventionTrebuchet-good_pics.pdf

de Camp, L. Sprague. "Master Gunner Apollonios." Technology and Culture 2, no. 3 (1961): 240-244. deCamp-MasterGunnerAppollonios.pdf

France, John. "Recent Writing on Medieval Warfare: From the Fall of Rome to C. 1300." The Journal of Military History 65, no. 2 (2001): 441-473. http://www.mifami.org/eLibrary/Medieval_Weapons_Sources/France-MedievalWarfare-to1300.pdf

Freeman, A. Z. "Wall-Breakers and River-Bridgers: Military Engineers in the Scottish Wars of Edward I." The Journal of British Studies 10, no. 2 (1971): 1-16. Freeman-Wall-Breakers-River-Bridgers.pdf

Hacker, Barton C. "Greek Catapults and Catapult Technology: Science, Technology, and War in the Ancient World." Technology and Culture 9, no. 1 (1968): 34-50. Hacker-CatapultTech.pdf

Tarver, W. T. S. "The Traction Trebuchet: A Reconstruction of an Early Medieval Siege Engine." Technology and Culture 36, no. 1 (1995): 136-167. Tarver-TrebuchetReconstruction-pics.pdf

Humphries, Paul Douglas. ""Of Arms and Men": Siege and Battle Tactics in the Catalan Grand Chronicles (1208-1387)." Military Affairs 49, no. 4 (1985): 173-178. Humphries-medievalbattletactics.pdf

Muendel, John. "Friction and Lubrication in Medieval Europe: The Emergence of Olive Oil as a Superior Agent." Isis 86, no. 3 (1995): 373-393. Muendel-LubricationMedieval.pdf

White, Lynn, Jr. "Technology Assessment from the Stance of a Medieval Historian." The American Historical Review 79, no. 1 (1974): 1-13. White-TechAssessment.pdf

Sabin, Philip A. G., Hans van Wees, and Michael Whitby. The Cambridge History of Greek and Roman Warfare. 2 vols. Cambridge: Cambridge University Press, 2007.Link to the 2 volumes