1. John Dewitt Norton,Economic Models: Methods, Uses, Prospects(Washington, D.C.: National Planning Association, Economic Programming Center, 1969), p. viii.
2. M. Hachiga,Hiroshima Diary(Chapel Hill: University of North Carolina Press, 1983), pp. 54–55.
3. Filip Muller,Eyewitness Auschwitz: Three Years in the Gas Chambers(New York: Stein and Day, 1979), p. 40.