I focus on English-language books mainly by philosophers, or that are obviously philosophically-minded. Totals are rounded to the nearest 100, and only books with at least 500 citations are listed. I could not find on Google Scholar Allen Wood’s Karl Marx in the Routledge “Arguments of the Philosophers” series, which would surely have made the list. If someone can find it, please let me know! Please also email me about other omissions or corrections.

1. G.A. Cohen, Karl Marx’s Theory of History: A Defence, 4,400
2. Jon Elster, Making Sense of Marx, 3,100
3. Bertell Ollmann, Alienation, 3,100
4. Shlomo Avineri, The Social and Political Philosophy of Karl Marx, 2,100
5. Steven Lukes, Marxism and Morality, 1,000
6. Jon Elster, An Introduction to Karl Marx, 900
7. G.A. Cohen, History, Labour and Freedom, 800
8. Agnes Heller, The Theory of Need in Marx, 800
9. Norman Geras, Marx and Human Nature, 700
10. Allen Buchanan, Marx and Justice: The Radical Critique of Capitalism, 600
11. Rodney Peffer, Marxism, Morality and Social Justice, 500