In Col. Clàssics del federalisme. Institut d’Estudis Autonòmics. Barcelona, 2012.
Pierre-Joseph Proudhon (15 January 1809 – 19 January 1865) was a French politician, mutualist philosopher, economist, and socialist. He was a member of the French Parliament and the first person to call himself an “anarchist“. He is considered among the most influential theorists and organizers of anarchism. After the events of 1848 he began to call himself a federalist. (Wikipedia, March 25, 2013).