Could There Be a Science of Economics?: on-line article by John Dupre
Evolutionary Economics and the Counterfactual Threat: on-line article by Robin Cowan and Dominique Foray
Genetic Causation and Economic Theory: on-line article by Robin Cowan and Mario J. Rizzo
History of Economic Thought Archive: Includes both primary texts, studies of those texts and of their authors
Philosophy of Economics Encyclopedia article: on-line article by Dan Hausman
The Principles of Political Economy: The Principles of Political Economy by J.S. Mill