A classic presentation of the theory that a just war is a war of defence against aggression is: Walzer, Michael, Just and Unjust Wars (New York: Basic Books, 1977, 2nd edition 1992). An important recent criticism of the analogy between war and self-defence is: David Rodin, War and Self-Defense (Oxford: Oxford University Press, 2002). My own further discussion of this topic is: Richard Norman, Ethics, Killing and War (Cambridge: Cambridge University Press, 1995).Google Scholar