Mackinder, Democratic Ideals and Reality (New York: Henry Holt, 1919); Vidal de Ia Blanche, Principles of Human Geography (Constable: London, 1936, 1962); Frederick Teggart, Theory of History (New Haven: Yale University Press, 1925); Frederick Jackson Turner, The Frontier in American History (New York: Holt, Rinehart, and Winston, 1920); H. G. Wells, The Idea of a League of Nations (Boston: Atlantic Monthly Press, 1919); James Burnham, The Managerial Revolution (New York: John Day, 1941); Nicholas J. Spykman, America's Strategy in World Politics (New York: Harcourt, Brace and Co., 1942); J. R. Seeley, The Expansion of England (Chicago: University of Chicago Press, 1971).