* Kennedy, Paul M., "The Rise and Fall of the Great Powers: Economic Changes and Military Conflict from 1500 to 2000" (1988)* Kleinschmidt, Harald, "Using the Gun: Manual Drill and the Proliferation of Portable Firearms," "The Journal of Military History," Vol.
* Howard, Michael, "War in European History" (1976), chs 1-4* Kennedy, Paul M., "The Rise and Fall of the Great Powers: Economic Changes and Military Conflict from 1500 to 2000" (1988)* Kleinschmidt, Harald, "Using the Gun: Manual Drill and the Proliferation of Portable Firearms, " "The Journal of Military History," Vol.