Josselin, Jean Michel; Marciano, Alain (2006). "The political economy of European federalism"(PDF). Series: Public Economics and Social Choice. Centre for Research in Economics and Management, University of Rennes 1, University of Caen. p. 12. WP 2006–07; UMR CNRS 6211. אורכב מ-המקור(PDF) ב-19 באוגוסט 2008. {{cite web}}: (עזרה)
Josselin, Jean Michel; Marciano, Alain (2006). "The political economy of European federalism"(PDF). Series: Public Economics and Social Choice. Centre for Research in Economics and Management, University of Rennes 1, University of Caen. p. 12. WP 2006–07; UMR CNRS 6211. אורכב מ-המקור(PDF) ב-19 באוגוסט 2008. {{cite web}}: (עזרה)