Letters of Helvetius on Perusing the Manuscript of The Spirit of Laws  
   Two letters by the scholar, translated by Thomas Jefferson.
   http://www.econlib.org/library/Tracy/ddtMSL28.html

Biography.com: Helvetius, Claude-Adrien  
   Short note on his life and legacy.
   http://search.biography.com/print_record.pl?id=5466

Influence of Helvetius on Bentham  
   Excerpts from John Stuart Mill's work, Beckham.
   http://www.class.uidaho.edu/mickelsen/texts/helvetius%20influence.htm

History of Economic Thought: Claude Adrien Helvetius  
   Profile and portrait of this Enlightenment thinker, with links to online French-language texts of his work.
   http://cepa.newschool.edu/het/profiles/helvetius.htm

Helvetius, Claude Adrien  
   Short biographical article from the 2001 Columbia Encyclopedia.
   http://www.bartleby.com/65/he/Helvetiu.html

FOLDOC: Helvaetius Claude-Adrien  
   Brief entry, with links to related topics, from this philosophical database.
   http://www.swif.uniba.it/lei/foldop/foldoc.cgi?Helvaetius+Claude-Adrien

Claude Adrien Helvetius  
   Wikipedia entry containing material from the 1911 Britannica.
   http://www.wikipedia.org/wiki/Helvetius