David Ricardo - Synopsis of his major theories.

Modern History Sourcebook | The Iron Law of Wages - A selection from Ricardo's book, On Wages, describing the labor theory of value.

Encyclopedia.com | Ricardo, David - Life and bibliography.

The Principles of Political Economy and Taxation - Ricardo's 1817 work in full. Third edition.

Ricardo's Problem of an Invariable Measure of Value - Complex paper on his currency theory.

The Theory of Comparative Advantage - A highlight on Ricardo's lasting contribution, as well as a biography/bibliography.

Works by Ricardo - "Essay on Profits" commenting on corn laws, and "The High Price of Bullion," on depreciation. Includes a bibliography and a PDF of the "Principles of Political Economy."

History of Economic Thought | David Ricardo - Biography, works, and links.

Comparative Advantage - An article by the WTO on Samuelson's challenge.