Marxian Economics - A survey from the History of Economic Thought website with bibliography and links.
Marxism - An article in the Concise Encyclopedia of Economics by David L. Prychitko.
Political Economy - Marx's writings on economics, reactions to Marx's economics and the Glossary of Political Economy from the Encyclopedia of Marxism.
Primer on Marxian Economics - A chapter from the Essential Principles of Economics provided by Drexel University.
