1. Geographies of empire: European empires and colonies, c. 1880-1960 Butlin, R. A. (Robin Alan), 1938- Cambridge, England ; Cambridge University Press, 2009. HIST350
2. Events that changed the world in the twentieth century Westport, Conn. : Greenwood Press, 1995. HIST320
3. The rise and fall of the great powers: economic change and military conflict from 1500 to 2000 Kennedy, Paul M., 1945- New York : Vintage Books, 1989, c1987. HIST220
