Comparative Advantage - An article by the WTO on Samuelson's challenge. www.wto.org/english/res_e/reser_e/cadv_e.htm
David Ricardo - Synopsis of his major theories. landow.stg.brown.edu/victorian/economics/ric.html
David Ricardo (1772-1823) - Short history and two excerpts from his writing: On Wages and On Machinery. www.phil.stmarytx.edu/Sauerhm/econhome/texts/ricardo.htm
The Theory of Comparative Advantage - A highlight on Ricardo's lasting contribution, as well as a biography/bibliography. www.systemics.com/docs/ricardo/david.html
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." socserv2.socsci.mcmaster.ca/~econ/ugcm/3ll3/ricardo