* David B. Audretsch ; Grilo, Isabel; Thurik, A. Roy (2007), Explaining entrepreneurship and the role of policy: a framework, in: David Audretsch, Isabel Grilo and A. Roy Thurik (eds.
* David B. Audretsch ; Grilo, Isabel; Thurik, A. Roy (2007), Explaining entrepreneurship and the role of policy: a framework, in: David Audretsch, Isabel Grilo and A. Roy Thurik (eds.