Article from the Stanford Encyclopedia of Philosophy, by Lorne Falkenstein. Biography, bibliography, and an extensive discussion of Condillac's theory of sensation. plato.stanford.edu/entries/condillac
Article from the Catholic Encyclopedia, by G.M. Sauvage. Divides Condillac's career into an early Lockean phase and a later, more original phase. www.newadvent.org/cathen/04210b.htm