1. Kenneth Waltz, Man, State and War (New York: Columbia University Press, 1959);
2. David Singer, “The Level of Analysis Problem in International Relations,” in Klaus Knorr and Sidney Verba (eds), The International System: Theoretical Essays (Princeton: Princeton University Press, 1961):77–92.
3. John Burton, Global Conflict: The Domestic Sources of International Crisis (Brighton: Wheatsheaf; College Park, MD: Center for International Development, 1984).
4. Lewis Richardson, Statistics of Deadly Quarrels (California: Boxwood Press, 1960).
5. Norman Alcock, War Disease (Oakville, Ont.: CPRI Press, 1972).