1. The System of Professions
2. Acs, Zoltan J.; David B. Audretsch; and David S. Evans. 1992.The Determinants of Variations in Self-Employment Rates Across Countries and Over Time. Discussion Paper, FS IV 92-3, Wissenschaftszentrum Berlin für Sozialforschung, Berlin.
3. Self Employment
4. Barbieri, Paolo. 1999. “Self-Employment in Italy.” Paper presented at the International Workshop on Self-Employment in Advanced Economies, July 2-3, Mannheim Center for European Social Research.