1. Acs, Zoltan and David Audretsch, 1989, ?Small Firms in U.S. Manufacturing: A First Report?,Economics Letters 31 (4), 399?402.
2. Acs, Zoltan and David Audretsch, 1990a, ?Small Firms in the 1990s?, in Zoltan Acs and David Audretsch (eds.),The Economics of Small Firms: A European Challenge, Dordrecht: Kluwer Academic Publishers.
3. Acs, Zoltan and David Audretsch, 1990b,Innovation and Small Firms, Cambridge, MA: MIT Press.
4. Mata, José, 1993, ?Small Firms in the Portuguese Manufacturing Industries?, in Zoltan Acs and David Audretsch (eds.),Small Firms and Entrepreneurship: An East-West Comparison, Cambridge: Cambridge University Press.
5. Piore, Michael and Charles Sabel, 1984,The Second Industrial Divide: Possibilities for Prosperity, New York: Basic Books.