The Poverty of Philosophy - A critique of Proudhon's Philosophy of Poverty, by Karl Marx. - http://www.marxists.org/archive/marx/works/1847/poverty-philosophy/
Pierre-Joseph Proudhon - Biography, resources, and links. - http://cepa.newschool.edu/~het/profiles/proudhon.htm
Proudhon's Bank of the People - Charles Dana's classic introduction to the ideas of Proudhon and mutualist-anarchism. - http://dwardmac.pitzer.edu/anarchist_archives/proudhon/dana.html
Proudhon - Information about Proudhon and some works of him. - http://www.cpm.ehime-u.ac.jp/akamacHomePage/akamac_E-text_Links/Proudhon.html
Philosophy of Misery - The famous essay by Proudhon. - http://socserv.socsci.mcmaster.ca/~econ/ugcm/3ll3/proudhon/misery.htm
Proudhon, Pierre-Joseph - Biography from encyclopedia of 1848 revolutions. - http://www.cats.ohiou.edu/~Chastain/ip/proudhon.htm
Proudhon and Anarchism - Proudhon's libertarian thought and the Anarchist movement by L. Gambone. - http://www.spunk.org/texts/writers/proudhon/sp001863.html
Proudhon Archive - Contains biography, bibliography and collected works of Proudhon. - http://dwardmac.pitzer.edu/anarchist_archives/proudhon/Proudhonarchive.html