Marx, Karl. The Marx-Engels Reader. 2nd ed. Edited by Robert C. Tucker. New York: W. W. Norton, 1978.
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“Marx on Aristotle: Freedom, Money, and Politics” by Harvey Mansfield
Mansfield, Harvey C. “Marx on Aristotle: Freedom, Money, and Politics.” The Review of Metaphysics 34, no. 2 (1980): 351–367.
On Karl Marx by Ernst Bloch
Bloch, Ernst. On Karl Marx. New York: Herder and Herder, 1971.
Marx and the Marxists by Sidney Hook
Hook, Sidney. Marx and the Marxists: The Ambiguous Legacy. Princeton, NJ: Van Nostrand, 1955.
Meaning in History by Karl Löwith
Lowith, Karl. Meaning in History: The Theological Implications of the Philosophy of History. Chicago: University of Chicago Press, 1949.
“What is Orthodox Marxism?” by Georg Lukács
Lukács, Georg. History and Class Consciousness: Studies in Marxist Dialectics. Translated by Rodney Livingstone. Cambridge, MA: The MIT Press, 1971.