Proudhon, P. (1974). Was ist das Eigentum? Verl. Freie Gesellschaft.
Citazione stile Chigago Style (17a edizione)Proudhon, Pierre-Joseph. Was Ist Das Eigentum? Frankfurt am Main: Verl. Freie Gesellschaft, 1974.
Citatione MLA (8a ed.)Proudhon, Pierre-Joseph. Was Ist Das Eigentum? Verl. Freie Gesellschaft, 1974.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.