Huntington, Samuel P., The Clash of Civilizations and the Remaking of World Order, Simon and Schuster, 1998.

Huntington analyzes world politics after the fall of Communism. Much of what was at the heart of Marxist revolutionary theory still remains, with an increasing threat of violence arising from renewed conflicts between countries and cultures that base their traditions on religious faith and dogma.

Marx, Karl, Capital: A Critique of Political Economy, Vol. 1, Penguin Classics, 1992.

Capital, an influential book considered by many to be Marx's greatest work, details the faults of the capitalist system and is based on Marx's thirty-year study of capitalism in England, the most advanced industrial society of Marx's day.

Richardson, R. Dan, Comintern Army: The International Brigades and the Spanish Civil War, University Press of Kentucky, 1982.

Richardson explores the history of the International Brigades, the volunteer army that fought on the side of the...